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Finding the Fourth Proportional to 819.25, 1,227.25 and 407.13

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Solution

The fourth proportional to 819.25, 1,227.25 and 407.13 is: 609.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.25 : 1,227.25 = 407.13 : x
  2. Step 2: Convert to fraction form
    819.25/1,227.25 = 407.13/x
  3. Step 3: Cross multiply
    819.25x = 1,227.25 × 407.13
  4. Step 4: Simplify right side
    819.25x = 499,650.29
  5. Step 5: Solve for x
    x = 499,650.29/819.25
  6. Step 6: Final answer
    x = 609.89

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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.