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 b: 3/b = 6/12

Back

b = 6.

Front

Solve for d: 5/d = 10/20

Back

d = 10.

Front

Solve for d: 7/d = 14/28

Back

d = 14.

Front

Solve for c: 1/c = 2/6

Back

c = 3.

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 do you do after cross multiplying?

Back

Solve the resulting equation for the variable.