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Finding the Fourth Proportional to 327.28, 490.61 and 144.78

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Solution

The fourth proportional to 327.28, 490.61 and 144.78 is: 217.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.28 : 490.61 = 144.78 : x
  2. Step 2: Convert to fraction form
    327.28/490.61 = 144.78/x
  3. Step 3: Cross multiply
    327.28x = 490.61 × 144.78
  4. Step 4: Simplify right side
    327.28x = 71,030.88
  5. Step 5: Solve for x
    x = 71,030.88/327.28
  6. Step 6: Final answer
    x = 217.04

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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.