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Finding the Fourth Proportional to 144.28, 198.78 and 122.44

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Solution

The fourth proportional to 144.28, 198.78 and 122.44 is: 168.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.28 : 198.78 = 122.44 : x
  2. Step 2: Convert to fraction form
    144.28/198.78 = 122.44/x
  3. Step 3: Cross multiply
    144.28x = 198.78 × 122.44
  4. Step 4: Simplify right side
    144.28x = 24,338.62
  5. Step 5: Solve for x
    x = 24,338.62/144.28
  6. Step 6: Final answer
    x = 168.69

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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.