References:
The 115/31 was the strangest idea offered. If you need the result in a single clock, please look *seriously* at the simple multiplier. These are designed as library elements for very fast results and can easily accommodate your "one clock cycle" requirement.
If your clock is 20 MHz, doing the 115/31 might be reasonable but it sure isn't single-clock friendly!
Another consideration: does this value get used somewhere that you can algebraically manipulate the values so a /31 or /sqrt(21) can be "pulled in" to other number manipulation?
PLEASE consider the multiplier.