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Finding the Fourth Proportional to 391.38, 586.98 and 147.90

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Solution

The fourth proportional to 391.38, 586.98 and 147.90 is: 221.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.38 : 586.98 = 147.90 : x
  2. Step 2: Convert to fraction form
    391.38/586.98 = 147.90/x
  3. Step 3: Cross multiply
    391.38x = 586.98 × 147.90
  4. Step 4: Simplify right side
    391.38x = 86,814.34
  5. Step 5: Solve for x
    x = 86,814.34/391.38
  6. Step 6: Final answer
    x = 221.82

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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.