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Finding the Fourth Proportional to 872.24, 1,306.92 and 487.28

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Solution

The fourth proportional to 872.24, 1,306.92 and 487.28 is: 730.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.24 : 1,306.92 = 487.28 : x
  2. Step 2: Convert to fraction form
    872.24/1,306.92 = 487.28/x
  3. Step 3: Cross multiply
    872.24x = 1,306.92 × 487.28
  4. Step 4: Simplify right side
    872.24x = 636,835.98
  5. Step 5: Solve for x
    x = 636,835.98/872.24
  6. Step 6: Final answer
    x = 730.12

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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.