Now, use the property of proportions to find "X."

3:4 = 24:X

3X = 4 x 24

3X = 96

1(3X) = 1(96) or 3X = 96

3

3

3

3

X = 32 quarts of water

or

cross multiply

3 = 24

4

X

Multiply the numerator of the first ratio by the denominator of the second ratio. Then

multiply the denominator of the first ratio by the numerator of the second ratio.

3X = 4 x 24

3X =

96

X = 32 quarts of water

If three ties cost .57, what is the cost of five ties at the same rate?

Let y = the cost of five ties.

3:12.57 = 5:y

3 =5

12.57 y

3y = 5 x 12.57 = 62.85

1(3y) = 1(62.85)

3

3

y = .95

a. 4:3 = 32:W

W = __________

MD0904

1-45

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