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Finding the Fourth Proportional to 327.88, 451.31 and 281.21

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Solution

The fourth proportional to 327.88, 451.31 and 281.21 is: 387.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.88 : 451.31 = 281.21 : x
  2. Step 2: Convert to fraction form
    327.88/451.31 = 281.21/x
  3. Step 3: Cross multiply
    327.88x = 451.31 × 281.21
  4. Step 4: Simplify right side
    327.88x = 126,911.33
  5. Step 5: Solve for x
    x = 126,911.33/327.88
  6. Step 6: Final answer
    x = 387.07

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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.