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Finding the Fourth Proportional to 122.52, 168.98 and 81.03

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Solution

The fourth proportional to 122.52, 168.98 and 81.03 is: 111.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.52 : 168.98 = 81.03 : x
  2. Step 2: Convert to fraction form
    122.52/168.98 = 81.03/x
  3. Step 3: Cross multiply
    122.52x = 168.98 × 81.03
  4. Step 4: Simplify right side
    122.52x = 13,692.91
  5. Step 5: Solve for x
    x = 13,692.91/122.52
  6. Step 6: Final answer
    x = 111.76

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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.