Math HELP! Footprint ignment, determine height by shoe size.?

We have an igment for math where we all get a big footprint of a giant. We have to be able to determine the height of this giant, arm length, leg length and hand size but foot size. The foot is 33 cm/13 inches, I think that would be a size 17 shoe in mens. We can make ratio's, charts & diagrams to solve this. In the end we need to make a little paragraph saying how we found out. Oh and the teacher said no answer is wrong, as long as I explain well. I don't know how to start off, and I need help making a ratio. Please help asap. :)