Determine if 4, 6, 8, 12 are in proportion.

The correct answer is Yes

4:6 = $\dfrac{4}{6}$ = $\dfrac{2}{3}$

8:12 = $\dfrac{8}{12}$ = $\dfrac{2}{3}$

∴ 4:6 = 8:12
Hence 4, 6, 8, 12 are in proportion.