Question

Determine if 2.5/10=?12/48
2.5
10
=
?
12
48
or 2.5/2=?12/24
2.5
2
=
?
12
24
is a proportion.

Answer 1

Check by simplifying or cross-multiplying.

1) 2.5/10 vs 12/48
- 2.5/10 = 0.25 = 1/4, and 12/48 = 0.25 = 1/4.
- Cross-multiply: 2.5·48 = 120 and 10·12 = 120 → equal.
So 2.5/10 = 12/48 (proportion).

2) 2.5/2 vs 12/24
- 2.5/2 = 1.25 = 5/4, and 12/24 = 0.5 = 1/2.
- Cross-multiply: 2.5·24 = 60 and 2·12 = 24 → not equal.
So 2.5/2 ≠ 12/24 (not a proportion).