Pre – Algebra Online Tutoring: Proportions

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Learn about Proportions from Certified Online Pre-Algebra Tutor

Extremes

Means are the terms that are close together.

Extremes are the terms that are further apart.

Cross Product Property of Proportions:

When two ratios are equal, then the cross products of the ratios are equal.

That is, for the proportion,

a: b = c: d,
a x d = b x c   
Means = Extremes

Let’s understand with an example:

1. Fill in the missing number to complete the proportion.
6/13= 42/x

Write an equivalent fraction with 42 as the numerator

2. Harry read 30 medieval books over the course of 15 weeks .How many books would he have read in 20 weeks? Assume the relationship is directly proportional.

Use cross products to solve the problem

After 20 weeks, Harry would have read 40 medieval books.