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Finding the Fourth Proportional to 102.87, 141.96 and 59.20

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Solution

The fourth proportional to 102.87, 141.96 and 59.20 is: 81.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.87 : 141.96 = 59.20 : x
  2. Step 2: Convert to fraction form
    102.87/141.96 = 59.20/x
  3. Step 3: Cross multiply
    102.87x = 141.96 × 59.20
  4. Step 4: Simplify right side
    102.87x = 8,404.70
  5. Step 5: Solve for x
    x = 8,404.70/102.87
  6. Step 6: Final answer
    x = 81.70

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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.