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

If 4 pizzas require 8 lbs of cheese, how much cheese is needed for 1 pizza?

Back

2 lbs.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method 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

a * d = b * c.

Front

Solve for x: 2/x = 4/8

Back

x = 4.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

If 3/4 = x/16, what is x?

Back

x = 12.

Front

What is the first step in solving a proportion?

Back

Identify the two ratios that are being compared.

Front

If 5/10 = x/20, what is x?

Back

x = 10.