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Finding the Fourth Proportional to 331.90, 457.17 and 279.38

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Solution

The fourth proportional to 331.90, 457.17 and 279.38 is: 384.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.90 : 457.17 = 279.38 : x
  2. Step 2: Convert to fraction form
    331.90/457.17 = 279.38/x
  3. Step 3: Cross multiply
    331.90x = 457.17 × 279.38
  4. Step 4: Simplify right side
    331.90x = 127,724.15
  5. Step 5: Solve for x
    x = 127,724.15/331.90
  6. Step 6: Final answer
    x = 384.83

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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.