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> SAT : Ratios and direct/indirect proportion Quiz
SAT : Ratios and direct/indirect proportion Quiz
Quiz
*Theme/Title:
Ratios and direct/indirect proportion
* Description/Instructions
Ratios describe the relationship between two or more values. Put another way, ratios are fractions, either
part-to-part
or
part-to-whole
. So the relationship 1 to 2 can be written as
$\frac{1}{2}$
or 1 : 2. You could say that for every 1 of
these
there are 2 of
those
. That is a
part-to-part
ratio. You could also say that for every 1 of
these
there are 3 of
these-
and
-those
. That is a
part-to-whole
relationship.
A
direct relationship
between two values means that if one of them is, for example, doubled, so is the other one. If one is halved, so is the other one. If
x
and
y
are directly proportional, this can be expressed as y = kx for some constant k.
An
inverse relationship
between two values means that if one of them is, for example, doubled, the other is halved. If one is multiplied by 3, the other is divided by 3. If
a
and
b
are inversely proportional, this can be expressed as
$\mathrm{b}=\frac{\mathrm{k}}{\mathrm{a}}$
for some constant k.
Group:
SAT Math
SAT Math Quizzes
Topic:
SAT
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