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Finding the Fourth Proportional to 487.50, 731.28 and 281.64

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Solution

The fourth proportional to 487.50, 731.28 and 281.64 is: 422.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.50 : 731.28 = 281.64 : x
  2. Step 2: Convert to fraction form
    487.50/731.28 = 281.64/x
  3. Step 3: Cross multiply
    487.50x = 731.28 × 281.64
  4. Step 4: Simplify right side
    487.50x = 205,957.70
  5. Step 5: Solve for x
    x = 205,957.70/487.50
  6. Step 6: Final answer
    x = 422.48

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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.