Ratios & Proportions - SAT Math
Card 1 of 5
State the formula for a proportion.
State the formula for a proportion.
Tap to reveal answer
$\frac{a}{b} = \frac{c}{d}$, where $a, b, c, d$ are quantities. States that two ratios are equal to each other.
$\frac{a}{b} = \frac{c}{d}$, where $a, b, c, d$ are quantities. States that two ratios are equal to each other.
← Didn't Know|Knew It →
What is the value of $x$ if $5:x = 2:3$?
What is the value of $x$ if $5:x = 2:3$?
Tap to reveal answer
$x = 7.5$. Cross multiply: $5 \times 3 = x \times 2$, so $15 = 2x$.
$x = 7.5$. Cross multiply: $5 \times 3 = x \times 2$, so $15 = 2x$.
← Didn't Know|Knew It →
Find the missing value in the proportion $\frac{9}{x} = \frac{3}{5}$.
Find the missing value in the proportion $\frac{9}{x} = \frac{3}{5}$.
Tap to reveal answer
$x = 15$. Cross multiply: $9 \times 5 = 3 \times x$, so $45 = 3x$.
$x = 15$. Cross multiply: $9 \times 5 = 3 \times x$, so $45 = 3x$.
← Didn't Know|Knew It →
Identify the missing term: $\frac{3}{4} = \frac{x}{8}$.
Identify the missing term: $\frac{3}{4} = \frac{x}{8}$.
Tap to reveal answer
$x = 6$. Cross multiply: $3 \times 8 = 4 \times x$, so $24 = 4x$.
$x = 6$. Cross multiply: $3 \times 8 = 4 \times x$, so $24 = 4x$.
← Didn't Know|Knew It →
What is the definition of a ratio?
What is the definition of a ratio?
Tap to reveal answer
A comparison of two quantities by division. Shows how many times one quantity contains another.
A comparison of two quantities by division. Shows how many times one quantity contains another.
← Didn't Know|Knew It →