Bare with me, this is going to get a little complicated. This is an issue Im running into, that I didnt even realize I was having until now. For some odd reason my model is touching the ground in blender, but when brought into sketchfab, my model floats about 0.08m off the ground, which entirely throws off setting the scaling of the world to 100. If we convert 0.08m into a percentage and subtract that from 100 we can compensate for this discrepancy. Take the floor height in sketchfab and multiply it by this number 57.14 (100 divided by the character dummy height which is 1.75) and subtract that from the 100. In my case .08 is turned into 4.57 which when subtracted from 100 is 95.43. BOOM I knew algebra was good for something.