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Finding the Fourth Proportional to 721.76, 1,082.67 and 478.15

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Solution

The fourth proportional to 721.76, 1,082.67 and 478.15 is: 717.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.76 : 1,082.67 = 478.15 : x
  2. Step 2: Convert to fraction form
    721.76/1,082.67 = 478.15/x
  3. Step 3: Cross multiply
    721.76x = 1,082.67 × 478.15
  4. Step 4: Simplify right side
    721.76x = 517,680.25
  5. Step 5: Solve for x
    x = 517,680.25/721.76
  6. Step 6: Final answer
    x = 717.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.