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Finding the Fourth Proportional to 519.11, 778.65 and 129.10

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Solution

The fourth proportional to 519.11, 778.65 and 129.10 is: 193.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.11 : 778.65 = 129.10 : x
  2. Step 2: Convert to fraction form
    519.11/778.65 = 129.10/x
  3. Step 3: Cross multiply
    519.11x = 778.65 × 129.10
  4. Step 4: Simplify right side
    519.11x = 100,523.72
  5. Step 5: Solve for x
    x = 100,523.72/519.11
  6. Step 6: Final answer
    x = 193.65

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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.