Ratio and Proportion
SSAT Upper Level · Flashcards · Recall
SSAT UPPER LEVEL · FLASHCARDS
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QUESTION
What is the unit rate for a ratio written as
a
:
b
a:b
a
:
b
?
QUESTION
What does it mean to say two ratios are proportional?
QUESTION
What is the cross-multiplication rule for
a
b
=
c
d
\frac{a}{b}=\frac{c}{d}
b
a
=
d
c
?
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ANSWER
a
d
=
b
c
ad=bc
a
d
=
b
c
(with
b
≠
0
b\neq^0
b
=
0
,
d
≠
0
d\neq^0
d
=
0
). For equal ratios, the product of the means equals the product of the extremes, ensuring proportionality.
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