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Finding the Fourth Proportional to 81.29, 111.98 and 67.23

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Solution

The fourth proportional to 81.29, 111.98 and 67.23 is: 92.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.29 : 111.98 = 67.23 : x
  2. Step 2: Convert to fraction form
    81.29/111.98 = 67.23/x
  3. Step 3: Cross multiply
    81.29x = 111.98 × 67.23
  4. Step 4: Simplify right side
    81.29x = 7,528.49
  5. Step 5: Solve for x
    x = 7,528.49/81.29
  6. Step 6: Final answer
    x = 92.61

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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.