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Finding the Fourth Proportional to 519.11, 778.51 and 287.96

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Solution

The fourth proportional to 519.11, 778.51 and 287.96 is: 431.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.11 : 778.51 = 287.96 : x
  2. Step 2: Convert to fraction form
    519.11/778.51 = 287.96/x
  3. Step 3: Cross multiply
    519.11x = 778.51 × 287.96
  4. Step 4: Simplify right side
    519.11x = 224,179.74
  5. Step 5: Solve for x
    x = 224,179.74/519.11
  6. Step 6: Final answer
    x = 431.85

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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.