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Finding the Fourth Proportional to 868.69, 1,198.79 and 519.38

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Solution

The fourth proportional to 868.69, 1,198.79 and 519.38 is: 716.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.69 : 1,198.79 = 519.38 : x
  2. Step 2: Convert to fraction form
    868.69/1,198.79 = 519.38/x
  3. Step 3: Cross multiply
    868.69x = 1,198.79 × 519.38
  4. Step 4: Simplify right side
    868.69x = 622,627.55
  5. Step 5: Solve for x
    x = 622,627.55/868.69
  6. Step 6: Final answer
    x = 716.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.