In the letter-and-number analogy DH : 48 :: FK : ?, which value replaces the question mark?

Each letter is turned into its place number and the two numbers are written one after the other. D is 4th and H is 8th, which set side by side read 48. F is 6th and K is 11th, which set side by side read 611. Neither adding nor multiplying will serve: 4 + 8 = 12 and $4\times 8=32$, and neither is 48, so 17 (the sum) and 66 (the product) both die on the given pair. 116 writes the two places the wrong way about.