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Finding the Fourth Proportional to 872.27, 1,306.64 and 432.20

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Solution

The fourth proportional to 872.27, 1,306.64 and 432.20 is: 647.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.27 : 1,306.64 = 432.20 : x
  2. Step 2: Convert to fraction form
    872.27/1,306.64 = 432.20/x
  3. Step 3: Cross multiply
    872.27x = 1,306.64 × 432.20
  4. Step 4: Simplify right side
    872.27x = 564,721.11
  5. Step 5: Solve for x
    x = 564,721.11/872.27
  6. Step 6: Final answer
    x = 647.42

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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.