Proportions

Front

What is a proportion?

Back

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

Front

If a/b = c/d, what is the cross product?

Back

The cross product is ad = bc.

Front

Solve for x: 2/3 = x/9

Back

x = 6.

Front

What does it mean if two ratios are in proportion?

Back

It means that the two ratios are equivalent, or that they represent the same relationship.

Front

Solve for k: 4/k = 2/8

Back

k = 16.

Front

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

Back

x = 10.

Front

What is the first step in solving a proportion?

Back

The first step is to cross-multiply.

Front

Solve for x: 3/x = 6/12

Back

x = 6.

Front

What is the relationship between the means and extremes in a proportion?

Back

In a proportion, the product of the means equals the product of the extremes.

Front

If 7/14 = x/28, what is x?

Back

x = 14.