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Finding the Fourth Proportional to 327.87, 491.36 and 281.41

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Solution

The fourth proportional to 327.87, 491.36 and 281.41 is: 421.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.87 : 491.36 = 281.41 : x
  2. Step 2: Convert to fraction form
    327.87/491.36 = 281.41/x
  3. Step 3: Cross multiply
    327.87x = 491.36 × 281.41
  4. Step 4: Simplify right side
    327.87x = 138,270.98
  5. Step 5: Solve for x
    x = 138,270.98/327.87
  6. Step 6: Final answer
    x = 421.73

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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.