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Finding the Fourth Proportional to 487.54, 731.44 and 140.87

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Solution

The fourth proportional to 487.54, 731.44 and 140.87 is: 211.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.54 : 731.44 = 140.87 : x
  2. Step 2: Convert to fraction form
    487.54/731.44 = 140.87/x
  3. Step 3: Cross multiply
    487.54x = 731.44 × 140.87
  4. Step 4: Simplify right side
    487.54x = 103,037.90
  5. Step 5: Solve for x
    x = 103,037.90/487.54
  6. Step 6: Final answer
    x = 211.34

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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.