Proportional Equations

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 isolate the variable.

Front

What does it mean if two quantities are directly proportional?

Back

If two quantities are directly proportional, as one quantity increases, the other quantity increases at a constant rate.

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then ad = bc, where a, b, c, and d are the quantities.

Front

Solve for x: 2/3 = x/9

Back

x = 6

Front

Solve for x: 5/x = 15/3

Back

x = 1

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 4/x = 8/12, what is x?

Back

x = 6

Front

What is an example of an inverse proportion?

Back

An example of an inverse proportion is speed and time; as speed increases, time taken decreases.

Front

Solve for x: 3/x = 6/9

Back

x = 4.5