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Finding the Fourth Proportional to 81.50, 122.11 and 67.14

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Solution

The fourth proportional to 81.50, 122.11 and 67.14 is: 100.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.50 : 122.11 = 67.14 : x
  2. Step 2: Convert to fraction form
    81.50/122.11 = 67.14/x
  3. Step 3: Cross multiply
    81.50x = 122.11 × 67.14
  4. Step 4: Simplify right side
    81.50x = 8,198.30
  5. Step 5: Solve for x
    x = 8,198.30/81.50
  6. Step 6: Final answer
    x = 100.60

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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.