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Finding the Fourth Proportional to 112.42, 155.15 and 81.44

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Solution

The fourth proportional to 112.42, 155.15 and 81.44 is: 112.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.42 : 155.15 = 81.44 : x
  2. Step 2: Convert to fraction form
    112.42/155.15 = 81.44/x
  3. Step 3: Cross multiply
    112.42x = 155.15 × 81.44
  4. Step 4: Simplify right side
    112.42x = 12,634.84
  5. Step 5: Solve for x
    x = 12,634.84/112.42
  6. Step 6: Final answer
    x = 112.39

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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.