## Ratios and Proportions

A proportion is a name we give to a statement that two ratios are equal. It can be written in two ways:

two equal fractions, __a__ = __c__** b d**

or,

using a colon, ** a:b = c:d**

(note found from www.math.com)

To find the proportion you must cross multiply.

Step 1 __X__ =__ 1__ ß multiply 1 by 15 =15

15 5 ß multiply 5 by X =5x

=5x = 15

Step 2 Divide everything by 5.

*All ways divide the numbers by the number front of the variables*

__5x__ =__ 15__

5 5

X=3