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Finding the Fourth Proportional to 97.92, 135.12 and 77.22

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Solution

The fourth proportional to 97.92, 135.12 and 77.22 is: 106.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.92 : 135.12 = 77.22 : x
  2. Step 2: Convert to fraction form
    97.92/135.12 = 77.22/x
  3. Step 3: Cross multiply
    97.92x = 135.12 × 77.22
  4. Step 4: Simplify right side
    97.92x = 10,433.97
  5. Step 5: Solve for x
    x = 10,433.97/97.92
  6. Step 6: Final answer
    x = 106.56

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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.