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Finding the Fourth Proportional to 331.18, 496.66 and 138.76

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Solution

The fourth proportional to 331.18, 496.66 and 138.76 is: 208.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.18 : 496.66 = 138.76 : x
  2. Step 2: Convert to fraction form
    331.18/496.66 = 138.76/x
  3. Step 3: Cross multiply
    331.18x = 496.66 × 138.76
  4. Step 4: Simplify right side
    331.18x = 68,916.54
  5. Step 5: Solve for x
    x = 68,916.54/331.18
  6. Step 6: Final answer
    x = 208.09

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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.