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Finding the Fourth Proportional to 81.30, 122.07 and 65.91

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Solution

The fourth proportional to 81.30, 122.07 and 65.91 is: 98.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.30 : 122.07 = 65.91 : x
  2. Step 2: Convert to fraction form
    81.30/122.07 = 65.91/x
  3. Step 3: Cross multiply
    81.30x = 122.07 × 65.91
  4. Step 4: Simplify right side
    81.30x = 8,046.34
  5. Step 5: Solve for x
    x = 8,046.34/81.30
  6. Step 6: Final answer
    x = 98.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.