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Finding the Fourth Proportional to 819.09, 1,227.87 and 408.02

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Solution

The fourth proportional to 819.09, 1,227.87 and 408.02 is: 611.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.09 : 1,227.87 = 408.02 : x
  2. Step 2: Convert to fraction form
    819.09/1,227.87 = 408.02/x
  3. Step 3: Cross multiply
    819.09x = 1,227.87 × 408.02
  4. Step 4: Simplify right side
    819.09x = 500,989.38
  5. Step 5: Solve for x
    x = 500,989.38/819.09
  6. Step 6: Final answer
    x = 611.64

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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.