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Finding the Fourth Proportional to 102.39, 141.17 and 74.85

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Solution

The fourth proportional to 102.39, 141.17 and 74.85 is: 103.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.39 : 141.17 = 74.85 : x
  2. Step 2: Convert to fraction form
    102.39/141.17 = 74.85/x
  3. Step 3: Cross multiply
    102.39x = 141.17 × 74.85
  4. Step 4: Simplify right side
    102.39x = 10,566.57
  5. Step 5: Solve for x
    x = 10,566.57/102.39
  6. Step 6: Final answer
    x = 103.20

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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.