A proportion is an equation that states two ratios are equal

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Presentation transcript:

A proportion is an equation that states two ratios are equal Proportions A proportion is an equation that states two ratios are equal

Ratios: 6 to 8 and 9 to 12 Proportion 6 = 9 8 12 The cross product of proportions are always equal For instance 6 x 12 = 72 and 8 x 9 = 72

Ratios: 5: 9 and 15: 27 Proportion 5 = 15 9 27 The cross product of proportions are always equal For instance 5 x 27 = 135 and 9 x 15 = 135

Which pairs could form a proportion? 3 = 6 8 16 6 = 4 9 6 4 = 5 8 9 8 x 6 = 48 3 x 16 = 48 YES 6 x 6 = 36 4 x 9 = 36 YES 4 x 9 = 36 5 x 8 = 40 NO

Solving Proportions: cross multiply 25 = x 35 7 35 x = 175 X = 5 N = 20 15 50 50n = 300 N = 6 3.6 = n 200 100 360 = 200n 1.8 = n