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Finding the Fourth Proportional to 2,135.87, 3,204.79 and 819.18

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Solution

The fourth proportional to 2,135.87, 3,204.79 and 819.18 is: 1,229.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,135.87 : 3,204.79 = 819.18 : x
  2. Step 2: Convert to fraction form
    2,135.87/3,204.79 = 819.18/x
  3. Step 3: Cross multiply
    2,135.87x = 3,204.79 × 819.18
  4. Step 4: Simplify right side
    2,135.87x = 2,625,299.87
  5. Step 5: Solve for x
    x = 2,625,299.87/2,135.87
  6. Step 6: Final answer
    x = 1,229.15

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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.