What is a proportion How can you tell if a proportion is tru

What is a proportion? How can you tell if a proportion is true or false after you have found the cross products? Use numerical examples to show a proportion and cross products.

Prealgebra Fifth Edition Margaret L. Lial American River College Diana L. Hestwood Minneapolis Community and Technical College

Solution

A proportion is two ratios which are equal to each other.

As in, 2 , 3 , 4 and 6 are in proportion because

2/3 = 4/6

We know that the proportion above is true because when we crossmultiply, we get

2*6 = 4*3

12 = 12 which is TRUE