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$\frac{9}{5} = \frac{X}{45}$

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Multiply and divide positive and negative fractions

Full solution

Q.

\frac{9}{5} = \frac{X}{45}

Set up proportion: Set up the proportion to solve for $X$ . We have the proportion $\frac{9}{5} = \frac{X}{45}$ . To find $X$ , we need to cross-multiply.
Cross-multiply: Cross-multiply to find the value of $X$ . $9 \times 45 = 5 \times X$ $405 = 5X$
Divide to solve: Divide both sides of the equation by $5$ to solve for $X$ . $\newline$ $\frac{405}{5} = \frac{5X}{5}$ $\newline$ $81 = X$

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