Solving 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

What does it mean if two ratios do not form a proportion?

Back

It means that the two ratios are not equivalent and do not represent the same relationship.

Front

Solve the proportion: 2/3 = x/12

Back

x = 8

Front

Solve the proportion: 5/x = 15/9

Back

x = 3.

Front

What is cross-multiplication?

Back

Cross-multiplication is a method used to solve proportions by multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 4/5 = x/20, what is x?

Back

x = 16.

Front

What is the first step in solving a proportion?

Back

Identify the two ratios that are being compared.

Front

Solve: 3/4 = 9/x

Back

x = 12.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.