C-11-Q178mediumsingle_mcqThe third proportional of 555 and 101010 is—a151515b202020c252525d303030ব্যাখ্যাThe third proportional xxx satisfies 5:10=10:x5:10=10:x5:10=10:x, so x=10×105=20x=\dfrac{10\times10}{5}=20x=510×10=20.