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Finding the Fourth Proportional to 122.68, 169.30 and 81.24

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Solution

The fourth proportional to 122.68, 169.30 and 81.24 is: 112.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.68 : 169.30 = 81.24 : x
  2. Step 2: Convert to fraction form
    122.68/169.30 = 81.24/x
  3. Step 3: Cross multiply
    122.68x = 169.30 × 81.24
  4. Step 4: Simplify right side
    122.68x = 13,753.93
  5. Step 5: Solve for x
    x = 13,753.93/122.68
  6. Step 6: Final answer
    x = 112.11

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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.