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Finding the Fourth Proportional to 81.27, 112.19 and 64.97

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Solution

The fourth proportional to 81.27, 112.19 and 64.97 is: 89.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.27 : 112.19 = 64.97 : x
  2. Step 2: Convert to fraction form
    81.27/112.19 = 64.97/x
  3. Step 3: Cross multiply
    81.27x = 112.19 × 64.97
  4. Step 4: Simplify right side
    81.27x = 7,288.10
  5. Step 5: Solve for x
    x = 7,288.10/81.27
  6. Step 6: Final answer
    x = 89.68

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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.