Ratios & Proportions
ACT · Flashcards · Recall
ACT · FLASHCARDS
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QUESTION
Identify the cross-multiplication method for
a
b
=
c
d
\frac{a}{b} = \frac{c}{d}
b
a
=
d
c
.
QUESTION
State the formula for a proportion.
QUESTION
What is the cross-products condition 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
. Cross multiply: multiply diagonally opposite terms to check equality.
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