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Finding the Fourth Proportional to 112.66, 155.39 and 81.61

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Solution

The fourth proportional to 112.66, 155.39 and 81.61 is: 112.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.66 : 155.39 = 81.61 : x
  2. Step 2: Convert to fraction form
    112.66/155.39 = 81.61/x
  3. Step 3: Cross multiply
    112.66x = 155.39 × 81.61
  4. Step 4: Simplify right side
    112.66x = 12,680.58
  5. Step 5: Solve for x
    x = 12,680.58/112.66
  6. Step 6: Final answer
    x = 112.56

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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.