Proportions  A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal.  3 = 6 is an example of a proportion.

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Proportions  A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal.  3 = 6 is an example of a proportion. 4 8 (A ratio is a fraction.)

How can you tell if ratios are in proportion?

Tell whether the ratios are proportional Since the cross products are equal, the ratios are proportional. 60 = ? 60 = 60 Find cross products

Tell whether the ratios are proportional. Since the cross products are equal, the ratios are proportional = 20 Find cross products = ?

Solving Proportions  When you do not know one of the four numbers in a proportion, set the cross products equal to each other and solve.

Solve the Proportion 6p = 12 5 p = 10 6p = 60 Find the cross products. Solve p 12 = ; the proportion checks =

Solve the Proportion 14 3 = 2g 21 = g 42 = 2g Find the cross products. Solve g = ; the proportion checks =