Solving Proportions
Pre-Algebra · Flashcards
PRE-ALGEBRA · FLASHCARDS
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QUESTION
Solve
x
4
=
9
12
\frac{x}{4} = \frac{9}{12}
4
x
=
12
9
.
QUESTION
When writing a proportion from a word problem, what must match in the two ratios?
QUESTION
Solve
2
x
=
8
20
\frac{2}{x} = \frac{8}{20}
x
2
=
20
8
.
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ANSWER
x
=
5
x = 5
x
=
5
. Cross-multiply:
8
x
=
40
8x = 40
8
x
=
40
, so
x
=
5
x = 5
x
=
5
.
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