2.10The fourth behaves differently

In C:

4 = F

In G:

4 = C

In D:

4 = G

Try these:

C → F

G → C

D → G

There is a sense of moving away from home.

Then:

F → G → C

sounds like:

departure → tension → home

Functionally:

IV → V → I

This is one of the most basic progressions in Western music.