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Finding the Fourth Proportional to 81.87, 122.67 and 67.52

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Solution

The fourth proportional to 81.87, 122.67 and 67.52 is: 101.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.87 : 122.67 = 67.52 : x
  2. Step 2: Convert to fraction form
    81.87/122.67 = 67.52/x
  3. Step 3: Cross multiply
    81.87x = 122.67 × 67.52
  4. Step 4: Simplify right side
    81.87x = 8,282.07
  5. Step 5: Solve for x
    x = 8,282.07/81.87
  6. Step 6: Final answer
    x = 101.16

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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.