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

When two ratios are equal, then the cross products of the ratios are equal.

That is, for the proportion, a:b = c:d ,  a x d = b x     

       
                          

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 ·  Ratios

 ·  Proportions

 ·  Distance, rate
    and time

 ·  Similar figures


First Glance In Depth Examples Workout
First Glance   In Depth   Examples   Workout

Proportions