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Finding the Fourth Proportional to 868.81, 1,198.92 and 519.43

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Solution

The fourth proportional to 868.81, 1,198.92 and 519.43 is: 716.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.81 : 1,198.92 = 519.43 : x
  2. Step 2: Convert to fraction form
    868.81/1,198.92 = 519.43/x
  3. Step 3: Cross multiply
    868.81x = 1,198.92 × 519.43
  4. Step 4: Simplify right side
    868.81x = 622,755.02
  5. Step 5: Solve for x
    x = 622,755.02/868.81
  6. Step 6: Final answer
    x = 716.79

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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.