If $a, b, c$ are continued proportional, the identity $\dfrac{a}{c} = \dfrac{a^2 + b^2}{b^2 + c^2}$ rests on substitutin

Question

If $a, b, c$ are continued proportional, the identity $\dfrac{a}{c} = \dfrac{a^2 + b^2}{b^2 + c^2}$ rests on substituting—

Accepted Answer

$b^2 = ac$

Answer

$a = c$

Answer

$a + b = c$

Answer

$b = a + c$

If a,b,ca, b, ca,b,c are continued proportional, the identity ac=a2+b2b2+c2\dfrac{a}{c} = \dfrac{a^2 + b^2}{b^2 + c^2}ca​=b2+c2a rests on substituting—