Identify Property: Identify the cross-multiplication property for proportions which states that in a proportion, the product of the means equals the product of the extremes. So, we can set up the equation: 3 * x = 7 * 15.Perform Multiplication: Perform the multiplication on the right side of the equation. Calculate 7 * 15 to get 105. So, the equation now is: 3 * x = 105.Divide to Solve: Divide both sides of the equation by 3 to solve for x. Divide 105 by 3 to get 35. So, the equation now is: x = 35.

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$\frac{3}{7}=\frac{15}{x}$

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\frac{3}{7}=\frac{15}{x}

Identify Property: Identify the cross-multiplication property for proportions which states that in a proportion, the product of the means equals the product of the extremes. $\newline$ So, we can set up the equation: $3 \times x = 7 \times 15$ .
Perform Multiplication: Perform the multiplication on the right side of the equation. $\newline$ Calculate $7 \times 15$ to get $105$ . $\newline$ So, the equation now is: $3 \times x = 105$ .
Divide to Solve: Divide both sides of the equation by $3$ to solve for $x$ . $\newline$ Divide $105$ by $3$ to get $35$ . $\newline$ So, the equation now is: $x = 35$ .