Do Now Solve each proportion by using cross products: 10/12 = x/18 6/8 = 15/x 4/8 = x/30.

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Presentation transcript:

Do Now Solve each proportion by using cross products: 10/12 = x/18 6/8 = 15/x 4/8 = x/30

Review The ratio of cocoa to milk in Mrs. Ruderman’s hot chocolate recipe is 3:5. The ratio of cocoa to milk in Ms. Eardley’s hot chocolate recipe is 7:9. Which hot chocolate will taste the most chocolaty?

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The human body is made up mostly of water. In fact, about 67% of a person’s total (100%) body weight is water. If Cameron weighs 90 pounds, about how much of his weight is water? Recall that a percent is a part of 100. Since you want to know the part of Cameron’s body that is water, you can set up and solve a proportion to find the answer. Part 67 = xPart Whole

Find the percent of each number. Using Proportions to Find Percents of Numbers 30% of = x · 50 = 100 · x 1,500 = 100x 1, = 100x 15 = x 30% of 50 is 15. Write a proportion. Set the cross products equal. Multiply. Divide each side by 100 to isolate the variable.

“Is over of” Rule What percent of 90 is 45?

“Is over of” Rule 12 is 8% of what number?

“Is over of” Rule What percent of 75 is 105?

“Is over of” Rule What is 65% of 80?

“Is over of” Rule 20 is 40% of what number?

“Is over of” Rule 80% of what number is 68?

“Is over of” Rule $12.00 is 25% of what amount of money?

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