Cross Products and 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, you can use cross multiplication, where you multiply the numerator of one ratio by the denominator of the other ratio.

Front

What is cross multiplication?

Back

Cross multiplication is a method used to solve proportions by multiplying the numerator of one fraction by the denominator of the other fraction.

Front

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

Back

The cross product is ad = bc.

Front

What does it mean if two ratios form a proportion?

Back

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

Front

Solve the proportion: 3/4 = x/20

Back

x = 15.

Front

Solve the proportion: 5/10 = x/30

Back

x = 15.

Front

What is the value of k if 2/k = 4/8?

Back

k = 4.

Front

If 1/3 = x/9, what is x?

Back

x = 3.

Front

What is the relationship between equivalent ratios?

Back

Equivalent ratios have the same value when simplified.