Solve for Proportions using Cross Multiplication

Front

What is a proportion?

Back

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

Front

What does cross multiplication mean?

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 equation?

Back

a * d = b * c.

Front

Solve for x: 2/x = 4/8

Back

x = 4.

Front

Solve for c: 5/c = 1/3

Back

c = 15.

Front

Solve for x: 3/x = 6/9

Back

x = 4.5.

Front

Solve for b: 10/b = 2/5

Back

b = 25.

Front

What is the first step in solving a proportion using cross multiplication?

Back

Identify the two ratios and set them equal to each other.

Front

What is the solution to the proportion 4/x = 8/16?

Back

x = 2.

Front

If 3/5 = x/15, what is x?

Back

x = 9.