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Finding the Fourth Proportional to 327.31, 490.54 and 281.35

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Solution

The fourth proportional to 327.31, 490.54 and 281.35 is: 421.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.31 : 490.54 = 281.35 : x
  2. Step 2: Convert to fraction form
    327.31/490.54 = 281.35/x
  3. Step 3: Cross multiply
    327.31x = 490.54 × 281.35
  4. Step 4: Simplify right side
    327.31x = 138,014.34
  5. Step 5: Solve for x
    x = 138,014.34/327.31
  6. Step 6: Final answer
    x = 421.66

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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.