4 inch in centimetre = 4 in * 2.54 cm = 10.16 cm
B). 8 inch in centimetre = 8 × 2.54 = 20.32cm
Question : The third proportional of $a$ and $\frac{b^4}{4a}$ is:
Option 1: $\frac{b^8}{16 a^2}$
Option 2: $\frac{b^8}{8 a^2}$
Option 3: $\frac{b^8}{8 a^3}$
Option 4: $\frac{b^8}{16 a^3}$
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