Question

The third proportional of 7 and 21 is​

Answer 1

Answer:

63

Step-by-step explanation:

a,b,c => $b^{2}$=ac

here,a=7

        b=21=>$b^{2}$=441

$b^{2}=ac\\441=7c\\=> c=\frac{441}{7}\\c=63$