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Finding the Fourth Proportional to 391.38, 587.06 and 102.81

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Solution

The fourth proportional to 391.38, 587.06 and 102.81 is: 154.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.38 : 587.06 = 102.81 : x
  2. Step 2: Convert to fraction form
    391.38/587.06 = 102.81/x
  3. Step 3: Cross multiply
    391.38x = 587.06 × 102.81
  4. Step 4: Simplify right side
    391.38x = 60,355.64
  5. Step 5: Solve for x
    x = 60,355.64/391.38
  6. Step 6: Final answer
    x = 154.21

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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.