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Finding the Fourth Proportional to 868.81, 1,198.96 and 495.80

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Solution

The fourth proportional to 868.81, 1,198.96 and 495.80 is: 684.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.81 : 1,198.96 = 495.80 : x
  2. Step 2: Convert to fraction form
    868.81/1,198.96 = 495.80/x
  3. Step 3: Cross multiply
    868.81x = 1,198.96 × 495.80
  4. Step 4: Simplify right side
    868.81x = 594,447.37
  5. Step 5: Solve for x
    x = 594,447.37/868.81
  6. Step 6: Final answer
    x = 684.21

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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.