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Finding the Fourth Proportional to 862.25, 1,286.75 and 769.97

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Solution

The fourth proportional to 862.25, 1,286.75 and 769.97 is: 1,149.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.25 : 1,286.75 = 769.97 : x
  2. Step 2: Convert to fraction form
    862.25/1,286.75 = 769.97/x
  3. Step 3: Cross multiply
    862.25x = 1,286.75 × 769.97
  4. Step 4: Simplify right side
    862.25x = 990,748.61
  5. Step 5: Solve for x
    x = 990,748.61/862.25
  6. Step 6: Final answer
    x = 1,149.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.