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 variable.

Front

What does it mean for two ratios to form a proportion?

Back

Two ratios form a proportion if they are equivalent, meaning they represent the same relationship.

Front

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

Back

The cross-multiplication method states that a*d = b*c.

Front

What is the first step in solving for x in a proportion?

Back

The first step is to set the two ratios equal to each other.

Front

Solve for x: 2/x = 4/8

Back

x = 4.

Front

Solve for x: 3/x = 6/12

Back

x = 6.

Front

What is the value of x in the proportion 5/x = 15/3?

Back

x = 1.

Front

If 10/20 = x/40, what is x?

Back

x = 20.

Front

What is an example of a non-proportion?

Back

The ratios 1/2 and 2/3 do not form a proportion.