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Finding the Fourth Proportional to 391.17, 587 and 147.87

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Solution

The fourth proportional to 391.17, 587 and 147.87 is: 221.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.17 : 587 = 147.87 : x
  2. Step 2: Convert to fraction form
    391.17/587 = 147.87/x
  3. Step 3: Cross multiply
    391.17x = 587 × 147.87
  4. Step 4: Simplify right side
    391.17x = 86,799.69
  5. Step 5: Solve for x
    x = 86,799.69/391.17
  6. Step 6: Final answer
    x = 221.90

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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.