Well, this is probably not the best example because human bodies are much taller than wider, so their volume wouldn't grow as fast as with a cube if you wanted to scale them.
It doesn't matter what the ratio in dimensions are, if you scale up while preserving them, volume goes up as the cube of linear measure.
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It seems more correct to me to say the Statue of Liberty is many thousands times bigger than a person than to say it is 50 times bigger than a person
It's the other way around for me, I'd interpret "bigger" as "taller"
If by many thousand times bigger, you mean 15 000 times bigger.
I have to admit that it is hard to say if that fits my intuition. But it is also kind of the point: it's much easier to compare heights than volumes.
edit: remove flawed reasoning while I still can :)
It doesn't matter what the ratio in dimensions are, if you scale up while preserving them, volume goes up as the cube of linear measure.
Right, edited.