No, KE and PE are not directly proportional.
As, we know that the increase of hight from the ground increases its potential energy in the sametime kinetic energy decreases and at the top of the height kinetic energy becomes zero.
On the other hand when a body is dropped from a height its height gradually decreases with increase in velocity and kinetic energy increases and when the body reaches at the ground its height becomes zero, so potential energy becomes zero.
So kinetic energy (Eₖ) and potential energy (Ep) are inversely proportional to each other.