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 isolate the variable.

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

Back

ad = bc.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

Solve the proportion: 2/3 = x/9

Back

x = 6.

Front

Solve the proportion: 4/5 = 12/x

Back

x = 15.

Front

What is the value of x in the proportion: 5/x = 10/20?

Back

x = 10.

Front

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

Back

x = 12.

Front

What is the first step in solving the proportion 7/x = 14/28?

Back

Cross-multiply to get 7 * 28 = 14 * x.