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Finding the Fourth Proportional to 87.17, 120.11 and 71.58

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Solution

The fourth proportional to 87.17, 120.11 and 71.58 is: 98.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.17 : 120.11 = 71.58 : x
  2. Step 2: Convert to fraction form
    87.17/120.11 = 71.58/x
  3. Step 3: Cross multiply
    87.17x = 120.11 × 71.58
  4. Step 4: Simplify right side
    87.17x = 8,596.87
  5. Step 5: Solve for x
    x = 8,596.87/87.17
  6. Step 6: Final answer
    x = 98.62

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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.