Question

If the terms 7,a,a,63 are the proportion, then a is

Answer 1

Answer:

21

Step-by-step explanation:

Given that 7,a,a,63 are in proportion ⇒ Product of mean  = product of extremes

∴ a^2 =7×63

⇒a^2 =441

⇒a= 21

Answer 2

Step-by-step explanation:

7:a::a:63

7/a=a/63

a^2=7×63

a^2=441 than

a=21