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Finding the Fourth Proportional to 102.38, 141.17 and 77.53

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Solution

The fourth proportional to 102.38, 141.17 and 77.53 is: 106.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.38 : 141.17 = 77.53 : x
  2. Step 2: Convert to fraction form
    102.38/141.17 = 77.53/x
  3. Step 3: Cross multiply
    102.38x = 141.17 × 77.53
  4. Step 4: Simplify right side
    102.38x = 10,944.91
  5. Step 5: Solve for x
    x = 10,944.91/102.38
  6. Step 6: Final answer
    x = 106.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.