Solving Proportions with Scale Factor

What are the 3 ratios you can create comparing figure A to similar figure B.

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How can you set up a relationship between 2 sides to find X? (2 answers)

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• None of the above

How can a value be found to use as the numerator and denominator in the Giant One?

• Look for a number that is between 4 and 6. This is the number you put in the numerator and denominator. For example, 5 would be the Giant One.

• You can't find the Giant One.

• Look for a number so that 4 multiplied by the value will equal 6. You can work backwards: 6 ÷ 4 = 1.5. 1.5 is the numerator and denominator in the Giant One.

Solve the proportion. When you find x, replace the value in the original proportion to confirm that the two ratios are equal.

• x = 10.5

• x = 15

• x = 31.5

• x = 30

If an apple juice container leaks 3 ounces every 19 minutes, how long will it take for the 16 ounces of juice in the container to leak out? Write a proportional equation and solve using the giant one.

• 200.2 minutes

• 98 minutes

• 101.3 minutes

• 143.6 minutes

The grocery store sells 3 limes for 99 cents. At this rate, how much will a dozen (12) limes cost? Determine the answer and if it is proportional or not.

• Not proportional. $3.96

• Proportional. $4.63

• Not Proportional. $4.63

• Proportional. $3.96

Which sides correspond with one another?

• 6 and 1

• 1 and 4

• 4 and 1

• 5 and 3

What do you do when a proportion doesn't have an obvious relationship/scale factor)?

• Cry :(

• Guess

• Hope for the best

• Simplify or scale up, THEN look for a relationship!

Solve the proportion.

• 42

• 6

• 2

• 28

• 27
• 12
• 1.333
• 3.67