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Finding the Fourth Proportional to 87.79, 121.11 and 60.11

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Solution

The fourth proportional to 87.79, 121.11 and 60.11 is: 82.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.79 : 121.11 = 60.11 : x
  2. Step 2: Convert to fraction form
    87.79/121.11 = 60.11/x
  3. Step 3: Cross multiply
    87.79x = 121.11 × 60.11
  4. Step 4: Simplify right side
    87.79x = 7,279.32
  5. Step 5: Solve for x
    x = 7,279.32/87.79
  6. Step 6: Final answer
    x = 82.92

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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.