These variables are not independent so you can't just multiply ratios to get combined ratio.

(If height were not correlated with income that would be surprising, for example.)

yeah that was my first thought too.

a dude who is 6'4'' isn't going to have tiny hands or feet, and probably not a tiny wang.

likewise height directly correlates to management & leadership roles

Now I'm not wont to ogle much in the swimming pool showers, but in my limited ocular estimation, wang size correlates much weaker than hands and feet.