Find the missing number in the proportion. \( \frac{3}{4}=\frac{x}{20} \)

To find the missing number \( x \) in the proportion \( \frac{3}{4}=\frac{x}{20} \), you can use cross-multiplication. Multiply 3 by 20 to get \( 3 \times 20 = 60 \), and then divide by 4: \( x = \frac{60}{4} = 15 \). So, the missing number \( x \) is 15. Fun fact: Proportions are not just a math tool; they can be found everywhere in real life, from cooking recipes (like the perfect pizza ratio!) to scaling up art projects. So next time you're adjusting a recipe, think of yourself as a proportion master!