<p><a target="_blank" href="https://www.prepswift.com/quizzes/quiz/prepswift-cross-multiplication">Cross Multiplication Exercise</a></p><p>If you're dealing with a proportion, you can use <strong><span style="color:#27ae60;">Cross Multiplication</span></strong> either to prove that the two fractions equal each other or solve for some unknown value. The way it works is you multiply the numerator of the fraction on the left by the denominator of the fraction on the right. You then set that equal to the product of the numerator on the right and denominator on the left. In essence, the two products "cross" each other.</p>
<p><span style="color:#8e44ad;"><span style="font-size:20px;">Proving Two Fractions Equal Each Other</span></span></p>
<p>$$\frac{5}{8}=\frac{15}{24}$$</p>
<p>$$5\times24=8\times15$$</p>
<p>$$120=120$$</p>
<p><span style="font-size:20px;"><span style="color:#8e44ad;">Solving For An Unknown Value</span></span></p>
<p>$$\frac{a}{9}=\frac{5}{3}$$</p>
<p>$$3a=5\times9$$</p>
<p>$$a=15$$</p>
<p> </p>