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Finding the Fourth Proportional to 331.38, 496.78 and 136.30

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Solution

The fourth proportional to 331.38, 496.78 and 136.30 is: 204.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.38 : 496.78 = 136.30 : x
  2. Step 2: Convert to fraction form
    331.38/496.78 = 136.30/x
  3. Step 3: Cross multiply
    331.38x = 496.78 × 136.30
  4. Step 4: Simplify right side
    331.38x = 67,711.11
  5. Step 5: Solve for x
    x = 67,711.11/331.38
  6. Step 6: Final answer
    x = 204.33

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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.