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Finding the Fourth Proportional to 349.12, 481.92 and 331.72

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Solution

The fourth proportional to 349.12, 481.92 and 331.72 is: 457.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.12 : 481.92 = 331.72 : x
  2. Step 2: Convert to fraction form
    349.12/481.92 = 331.72/x
  3. Step 3: Cross multiply
    349.12x = 481.92 × 331.72
  4. Step 4: Simplify right side
    349.12x = 159,862.50
  5. Step 5: Solve for x
    x = 159,862.50/349.12
  6. Step 6: Final answer
    x = 457.90

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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.