3/4 = 15/?

1 answer

To solve for the unknown value (let's call it \( x \)) in the proportion \( \frac{3}{4} = \frac{15}{x} \), you can use cross-multiplication. Here's the step-by-step process:

1. Cross-multiply the terms:
\[ 3 \times x = 4 \times 15 \]

2. Simplify the right side of the equation:
\[ 3x = 60 \]

3. Divide both sides by 3 to solve for \( x \):
\[ x = \frac{60}{3} = 20 \]

So, the unknown value \( x \) is 20. Therefore:
\[ \frac{3}{4} = \frac{15}{20} \]