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Finding the Fourth Proportional to 144.20, 198.48 and 138.92

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Solution

The fourth proportional to 144.20, 198.48 and 138.92 is: 191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.20 : 198.48 = 138.92 : x
  2. Step 2: Convert to fraction form
    144.20/198.48 = 138.92/x
  3. Step 3: Cross multiply
    144.20x = 198.48 × 138.92
  4. Step 4: Simplify right side
    144.20x = 27,572.84
  5. Step 5: Solve for x
    x = 27,572.84/144.20
  6. Step 6: Final answer
    x = 191.21

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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.