Applications of Proportions
Read this text. Pay attention to the gray box labeled Cross Products of a Proportion, which shows the simple way to solve for an unknown value in a proportion. Complete the practice problems and check your answers.
Exercises
EXAMPLE 6.40
Write each sentence as a proportion:
(a) 
is to 
as 
is to 
.
(b) 
hits in 
at bats is the same as 
hits in 
at-bats.
(c) 
for 6 ounces is equivalent to 
for 
ounces.
EXAMPLE 6.41
Determine whether each equation is a proportion:
(a) 
(b) 
EXAMPLE 6.42
Solve: 
.
EXAMPLE 6.43
Solve: 
.
EXAMPLE 6.44
Solve: 
.