Question

complete each statement.

If$a:3=7:4$then$4a=?$

Short answer

The final answer is,$4a=21$ .

Step-by-step solution

Step 1. Given information.

The given proportion is,

$a:3=7:4$

Step 2. Solve it by cross-multiplication method.

It is given that$a:3=7:4$,

So, $\frac{a}{3}=\frac{7}{4}$

Step 3. The product of means is equal to product of extremes.

So,

$4a=21$

Therefore, the final answer is,$4a=21$ .