Page 393 - Basic College Mathematics with Early Integers

Vocabulary and Readiness Check

Use the words and phrases below to fill in each blank.

ratio cross products true
false proportion
4.2 1 7
1. = is called a while is called a(n) .
8.4 2 8
a c
#
#
2. In = , a d and b c are called .
b d
3. In a proportion, if cross products are equal, the proportion is .
4. In a proportion, if cross products are not equal, the proportion is .
Use cross products and mentally determine whether each proportion is true or false.

2 6 3 15 1 3 2 1 2 40 3 6
5. = 6. = 7. = 8. = 9. = 10. =
1 3 1 5 2 5 11 5 3 60 4 8

5.2 Exercise Set FOR EXTRA HELP

Objective Write each sentence as a proportion. See Example 1.

1. 10 diamonds is to 6 opals as 5 diamonds is to 3 opals. 2. 8 books is to 6 courses as 4 books is to 3 courses.

3. 3 printers is to 12 computers as 1 printer is to 4. 4 hit songs is to 16 releases as 1 hit song is to
4 computers. 4 releases.

5. 6 eagles is to 58 sparrows as 3 eagles is to 6. 12 errors is to 8 pages as 1.5 errors is to 1 page.
29 sparrows.

1 3 1 3
7. 2 cups of flour is to 24 cookies as 6 cups of flour 8. 1 cups milk is to 10 bagels as cup milk is to
4 4 2 4
is to 72 cookies. 5 bagels.

Copyright 2012 Pearson Education, Inc.
9. 22 vanilla wafers is to 1 cup of cookie crumbs as 10. 1 cup of instant rice is to 1.5 cups cooked rice as
55 vanilla wafers is to 2.5 cups of cookie crumbs. 1.5 cups of instant rice is to 2.25 cups of cooked rice.
(Source: Based on data from Family Circle magazine) (Source: Based on data from Family Circle magazine)

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