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Finding the Fourth Proportional to 354.11, 487.99 and 349.55

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Solution

The fourth proportional to 354.11, 487.99 and 349.55 is: 481.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.11 : 487.99 = 349.55 : x
  2. Step 2: Convert to fraction form
    354.11/487.99 = 349.55/x
  3. Step 3: Cross multiply
    354.11x = 487.99 × 349.55
  4. Step 4: Simplify right side
    354.11x = 170,576.90
  5. Step 5: Solve for x
    x = 170,576.90/354.11
  6. Step 6: Final answer
    x = 481.71

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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.