Question

Is the correlation between different members on a person's body directly proportional? For instance, can a person with giant feet have small hands?

Answer 1

Yes, within normal variations of individuals.

Explanation:

It may be possible for a person to have an extreme appendage size compared to other parts, but that would be an abnormality. The following site describes a statistical test done on body proportions.
http://hypertextbook.com/facts/2006/bodyproportions.shtml

This site is more about the normal range of variations that are considered normal. None of them is an extreme case.

https://insideoutstyleblog.com/2009/04/body-proportions-explained.html