# Proportion Word Problems

#### Grade 7 Math Worksheets

**Proportion Word Problems involve finding the relationship between two or more quantities, and using that relationship to solve a problem.**

Table of Contents:

- Proportion Word Problems
- Examples
- Formula
- FAQs

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## Proportion Word Problems - Grade 7 Math Worksheet PDF

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## Proportion Word Problems

Proportion word problems involve finding the relationship between two or more quantities, and using that relationship to solve a problem.

The key concept is proportionality – when two quantities are proportional, their ratio remains constant even as the values of the quantities change.

Proportion word problems can involve different types of quantities, such as distance, time, weight, or cost. They can also involve different types of scenarios, such as cooking, manufacturing, or financial planning.

To solve proportion word problems, you need to set up a proportion that relates the two quantities and use algebra to solve for the unknown variable. The proportion can be written as a fraction, a ratio, or an equation, depending on the context of the problem.

Proportion word problems are important because they help you develop your problem-solving skills, algebraic thinking, and real-world applications of math.

### Here are some examples of proportion word problems

**A car travels 180 miles in 3 hours. How long will it take the car to travel 240 miles?**

**Solution:** We can set up a proportion using the distance and time values. Let x be the time it takes to travel 240 miles. Then, we have:

180 miles / 3 hours = 240 miles / x hours

Simplifying the proportion, we get:

60 miles/hour = 240 miles / x

Cross-multiplying, we get:

60x = 240

x = 4

Therefore, it will take the car 4 hours to travel 240 miles.

**A recipe calls for 2 cups of sugar for every 3 cups of flour. If you want to make a batch of cookies using 6 cups of flour, how much sugar do you need?**

**Solution:** We can set up a proportion using the sugar and flour values. Let x be the amount of sugar needed. Then, we have:

2 cups of sugar / 3 cups of flour = x cups of sugar / 6 cups of flour

Simplifying the proportion, we get:

x = 4 cups of sugar

Therefore, you need 4 cups of sugar to make the batch of cookies using 6 cups of flour.

**A machine can produce 8 widgets in 10 minutes. How long will it take to produce 40 widgets?**

**Solution:** We can set up a proportion using the widget and time values. Let x be the time it takes to produce 40 widgets. Then, we have:

8 widgets / 10 minutes = 40 widgets / x minutes

Simplifying the proportion, we get:

x = 50 minutes

Therefore, it will take the machine 50 minutes to produce 40 widgets.

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## Formula of Proportion Word Problems

The formula for solving proportion word problems involves setting up a proportion and solving for the unknown variable. The formula can be written as:

**a / b = c / d**

where a, b, c, and d are the quantities involved in the problem, and we are solving for the unknown variable.

To use the formula, you need to identify the two quantities that are proportional and set up a proportion that relates them. Then, you can cross-multiply the terms and solve for the unknown variable using algebraic techniques.

For example, if you have a problem that involves finding the cost of x items given the cost of y items, you can set up the proportion as:

x items / y items = cost of x items / cost of y items

Then, you can cross-multiply and solve for the unknown variable, which in this case is the cost of x items.

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## Proportion Word Problems FAQS

##### Why are proportion word problems important?

Proportion word problems are important because they help you develop your problem-solving skills, algebraic thinking, and real-world applications of math. They are used in various fields such as cooking, manufacturing, or financial planning.

##### What is the formula for solving proportion word problems?

The formula for solving proportion word problems involves setting up a proportion and solving for the unknown variable. The formula can be written as: a / b = c / d, where a, b, c, and d are the quantities involved in the problem, and we are solving for the unknown variable.

##### What are some common types of quantities involved in proportion word problems?

Common types of quantities involved in proportion word problems include distance, time, weight, or cost. However, proportions can be set up using any type of quantity as long as they are related to each other.

##### How do you know if two quantities are proportional?

Two quantities are proportional if their ratio remains constant even as the values of the quantities change. In other words, if you multiply one quantity by a certain factor, the other quantity should also be multiplied by the same factor to maintain the same ratio.

##### What are some common strategies for solving proportion word problems?

Some common strategies for solving proportion word problems include setting up a proportion and cross-multiplying, using ratios to find missing values, or using algebraic techniques to solve for unknown variables. It’s also important to carefully read and understand the problem before attempting to solve it.

**Gloria Mathew** writes on math topics for K-12. A trained writer and communicator, she makes math accessible and understandable to students at all levels. Her ability to explain complex math concepts with easy to understand examples helps students master math. LinkedIn

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