Question

if the terms7,a,a,63 are in proportion, then a is answer is 21

Answer 1

a^2=63×7




a is equal to 441 ka square root
which is 21

Answer 2

Given-
7:a::a:63
7/a=a/63
7/63=axa
1/9=a^2
√1/9=a
1/3=a