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Finding the Fourth Proportional to 331.20, 496.92 and 138.80

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Solution

The fourth proportional to 331.20, 496.92 and 138.80 is: 208.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 496.92 = 138.80 : x
  2. Step 2: Convert to fraction form
    331.20/496.92 = 138.80/x
  3. Step 3: Cross multiply
    331.20x = 496.92 × 138.80
  4. Step 4: Simplify right side
    331.20x = 68,972.50
  5. Step 5: Solve for x
    x = 68,972.50/331.20
  6. Step 6: Final answer
    x = 208.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.