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Finding the Fourth Proportional to 81.03, 122.14 and 67.59

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Solution

The fourth proportional to 81.03, 122.14 and 67.59 is: 101.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.03 : 122.14 = 67.59 : x
  2. Step 2: Convert to fraction form
    81.03/122.14 = 67.59/x
  3. Step 3: Cross multiply
    81.03x = 122.14 × 67.59
  4. Step 4: Simplify right side
    81.03x = 8,255.44
  5. Step 5: Solve for x
    x = 8,255.44/81.03
  6. Step 6: Final answer
    x = 101.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.