If a : b = c : d then a : c = b : d. This is the theorem of ____?

If a : b = c : d then a : c = b : d. This is the theorem of ____?

Explanation

The given statement:

If a : b = c : d then a : c = b : d

This is known as the Alternendo theorem.

The Alternendo theorem states that if a/b = c/d, then a/c = b/d.