proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Front

Back

x = 26

Front

Back

n = 5.5

Front

Back

x = 15

Front

Back

x = 28

Front

Back

x = 20

Front

What does cross-multiplication mean in proportions?

Back

Cross-multiplication means multiplying the numerator of one ratio by the denominator of the other ratio.

Front

Back

The relationship is that a times d equals b times c (ad = bc).

Front

Back

The first step is to cross-multiply: 5 * 20 = 10 * x.