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Finding the Fourth Proportional to 81.74, 112.92 and 80.66

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Solution

The fourth proportional to 81.74, 112.92 and 80.66 is: 111.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.74 : 112.92 = 80.66 : x
  2. Step 2: Convert to fraction form
    81.74/112.92 = 80.66/x
  3. Step 3: Cross multiply
    81.74x = 112.92 × 80.66
  4. Step 4: Simplify right side
    81.74x = 9,108.13
  5. Step 5: Solve for x
    x = 9,108.13/81.74
  6. Step 6: Final answer
    x = 111.43

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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.