How to get a representative random number from a set of pseudo random numbers?

Let's say I got three pseudo random numbers from different pseudo random number generators. Since the generators would reflect only a part of the real random number generating process, I believe that one way to get a number closer to real random might be to somehow get a "center" of the three pseudo random numbers. An easy way to get that "center" would be to take average, median or mode (if any) of them. I am wondering if there's a more sophisticated way due to the fact that they should represent random numbers.