How do Solve Proportions

Before we learn about how to solve proportions.. let me help you go through cross multiplication to solve proportion. this will help you understand better about proportion..

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

When the terms of a proportion are cross multiplied, the cross products are equal.

Cross multiplication is the multiplication of the numerator of the first ratio by the denominator of the second ratio and the multiplication of the denominator of the first ratio by the numerator of the second ratio.

    21      3     --  =  --            70     10     21 * 10 = 70 * 3       210 = 210 

If one term of a proportion is not known, cross multiplication can be used to find the value of that term.

     x      3     --  =  --            70     10     x * 10 = 70 * 3       10x = 210            10x   210     --- = ---     10    10            x = 21 

This was just a sample problems on proportion.... keep reading and leave your valuable comments .. may be in the next lesson.. let me help you go through deeply on Algebra , number system, and matrix. I feel these are the major and simple topic which we need to know before we learn anything about math,,, Keep reading and leave your valuable comments... to help you better.