If you haven't already noticed, when all the numbers on the bottom are the same, the top number is the bottom number x4.
Another thing is that if the bottom numbers are consecutive, such as 1,2,3 or 5,6,7 or even 4,3,2 ; the top number is the middle number on the bottom x4.
One last thing, this is quite interesting. I have found a pattern. If you start with the triangle's bottom numbers all at 0, and move the bottom left corner's value up one to 1, the top number will move up one as well. Then move the bottom middle circle's value up one to 1 and the top number will move up 2, to 3. And finally, move the bottom right corner's value up one and the top number will move up one again, now to 4.
So the pattern is 1,2,1 for Number Triangles and funnily enough, 1,2,1 is in Pascal's Triangle too.