To determine if the given statements form proportions, we need to check if the cross products of each fraction are equal.
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For \( \frac{2.5}{10} = \frac{12}{48} \):
Cross-multiplying gives: \[ 2.5 \times 48 \quad \text{and} \quad 10 \times 12 \] Calculating both: \[ 2.5 \times 48 = 120 \] \[ 10 \times 12 = 120 \] Since both products are equal (120 = 120), \( \frac{2.5}{10} = \frac{12}{48} \) is a proportion.
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For \( \frac{2.5}{2} = \frac{12}{24} \):
Cross-multiplying gives: \[ 2.5 \times 24 \quad \text{and} \quad 2 \times 12 \] Calculating both: \[ 2.5 \times 24 = 60 \] \[ 2 \times 12 = 24 \] Since the products are not equal (60 ≠ 24), \( \frac{2.5}{2} \neq \frac{12}{24} \), so this is not a proportion.
In conclusion, only the first statement is a proportion. So the answer is:
Only the first statement is a proportion.