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Finding the Fourth Proportional to 819.76, 1,229.98 and 511.86

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Solution

The fourth proportional to 819.76, 1,229.98 and 511.86 is: 768.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.76 : 1,229.98 = 511.86 : x
  2. Step 2: Convert to fraction form
    819.76/1,229.98 = 511.86/x
  3. Step 3: Cross multiply
    819.76x = 1,229.98 × 511.86
  4. Step 4: Simplify right side
    819.76x = 629,577.56
  5. Step 5: Solve for x
    x = 629,577.56/819.76
  6. Step 6: Final answer
    x = 768.00

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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.