Solve 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 cross-multiplication mean?

Back

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

Front

If a/b = c/d, what is the cross-multiplication equation?

Back

The cross-multiplication equation is a * d = b * c.

Front

Solve for M in the proportion: 5/M = 1/3.

Back

M = 15.

Front

Solve for C in the proportion: C/12 = 3/4.

Back

C = 9.

Front

Solve for Z in the proportion: 7/Z = 21/3.

Back

Z = 1.

Front

Solve for X in the proportion: 10/X = 5/2.

Back

X = 4.

Front

What is the first step in solving a proportion?

Back

Identify the two ratios that are being compared.

Front

What is an example of a real-life proportion?

Back

If a recipe calls for 2 cups of flour for every 3 cups of sugar, the ratio of flour to sugar is a proportion.