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Finding the Fourth Proportional to 112.97, 155.90 and 81.98

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Solution

The fourth proportional to 112.97, 155.90 and 81.98 is: 113.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.97 : 155.90 = 81.98 : x
  2. Step 2: Convert to fraction form
    112.97/155.90 = 81.98/x
  3. Step 3: Cross multiply
    112.97x = 155.90 × 81.98
  4. Step 4: Simplify right side
    112.97x = 12,781.28
  5. Step 5: Solve for x
    x = 12,781.28/112.97
  6. Step 6: Final answer
    x = 113.14

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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.