Determine if 2.5/10= 12/48 or 2.5/2=12/24 is a porportion

The first comparison, 2.5/10 = 12/48, is not a proportion because when simplified, it becomes 1/4 ≠ 1/4.

The second comparison, 2.5/2 = 12/24, is a proportion because when simplified, it becomes 1.25 = 0.5.