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Finding the Fourth Proportional to 87.92, 122.14 and 87.08

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Solution

The fourth proportional to 87.92, 122.14 and 87.08 is: 120.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.92 : 122.14 = 87.08 : x
  2. Step 2: Convert to fraction form
    87.92/122.14 = 87.08/x
  3. Step 3: Cross multiply
    87.92x = 122.14 × 87.08
  4. Step 4: Simplify right side
    87.92x = 10,635.45
  5. Step 5: Solve for x
    x = 10,635.45/87.92
  6. Step 6: Final answer
    x = 120.97

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.