Jackson hikes 220.2 meters up a mountain. If he is 60% of the way up, how tall is the mountain?
Let's assume the height of the mountain is h meters.
Since Jackson is 60% of the way up, he has h * 60/100 = 0.6h meters left to climb.
We are given that Jackson hikes 220.2 meters up the mountain, so 0.6h = 220.2.
Simplifying the equation, we find that 0.6h = 220.2, which means h = 220.2 / 0.6 = <<220.2/0.6=367>>367 meters.
Therefore, the height of the mountain is 367 meters. Answer: \boxed{367}.