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Finding the Fourth Proportional to 87.79, 121.17 and 60.13

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Solution

The fourth proportional to 87.79, 121.17 and 60.13 is: 82.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.79 : 121.17 = 60.13 : x
  2. Step 2: Convert to fraction form
    87.79/121.17 = 60.13/x
  3. Step 3: Cross multiply
    87.79x = 121.17 × 60.13
  4. Step 4: Simplify right side
    87.79x = 7,285.95
  5. Step 5: Solve for x
    x = 7,285.95/87.79
  6. Step 6: Final answer
    x = 82.99

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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.