Question

solve for r in the proportion. $\frac{8}{28}=\frac{r}{21}$ $r = square$

Explanation:

Step1: Cross - multiply

$28r = 6\times21$

Step2: Calculate the right - hand side

$28r=126$

Step3: Solve for r

$r=\frac{126}{28}=\frac{9}{2} = 4.5$

Answer:

$4.5$