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Finding the Fourth Proportional to 122.01, 168.28 and 112.78

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Solution

The fourth proportional to 122.01, 168.28 and 112.78 is: 155.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.01 : 168.28 = 112.78 : x
  2. Step 2: Convert to fraction form
    122.01/168.28 = 112.78/x
  3. Step 3: Cross multiply
    122.01x = 168.28 × 112.78
  4. Step 4: Simplify right side
    122.01x = 18,978.62
  5. Step 5: Solve for x
    x = 18,978.62/122.01
  6. Step 6: Final answer
    x = 155.55

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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.