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Finding the Fourth Proportional to 391.35, 587.25 and 147.87

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Solution

The fourth proportional to 391.35, 587.25 and 147.87 is: 221.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.35 : 587.25 = 147.87 : x
  2. Step 2: Convert to fraction form
    391.35/587.25 = 147.87/x
  3. Step 3: Cross multiply
    391.35x = 587.25 × 147.87
  4. Step 4: Simplify right side
    391.35x = 86,836.66
  5. Step 5: Solve for x
    x = 86,836.66/391.35
  6. Step 6: Final answer
    x = 221.89

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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.