6.2 Proportions.

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Presentation transcript:

6.2 Proportions

A proportion is a statement that two ratios or rates are equal. Solving Proportions A proportion is a statement that two ratios or rates are equal. If and are two ratios, then is a proportion. a b c d =

Solving Proportions A proportion contains four numbers. If any three numbers are known, the fourth number can be found by solving the proportion. To solve use cross products. bc a b c d = ad a b c d Multiply both sides by the LCD, bd These are called cross products. ad = bc Simplify cross product

Determining Whether Proportions are True ? True proportion

Finding Unknown Numbers in Proportions Cross multiply. Simplify the left side. Divide both sides by 28. Check: (Rounded)