NCERT Example 1 - Proportional ratios - Proportional Reasoning-1

Question: Are the ratios 3 : 4 and 72 : 96 proportional?

Answer: Yes. Ladder: HCF(72, 96) = 2 × 2 × 2 × 3 = 24. So 72 : 96 → 3 : 4, matching 3 : 4. Cross-check: 3 × 96 = 4 × 72 = 288.

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