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Finding the Fourth Proportional to 108.71, 149.83 and 81.17

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Solution

The fourth proportional to 108.71, 149.83 and 81.17 is: 111.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.71 : 149.83 = 81.17 : x
  2. Step 2: Convert to fraction form
    108.71/149.83 = 81.17/x
  3. Step 3: Cross multiply
    108.71x = 149.83 × 81.17
  4. Step 4: Simplify right side
    108.71x = 12,160.75
  5. Step 5: Solve for x
    x = 12,160.75/108.71
  6. Step 6: Final answer
    x = 111.87

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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.