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Finding the Fourth Proportional to 1,229.11, 1,843.97 and 681.75

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Solution

The fourth proportional to 1,229.11, 1,843.97 and 681.75 is: 1,022.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.11 : 1,843.97 = 681.75 : x
  2. Step 2: Convert to fraction form
    1,229.11/1,843.97 = 681.75/x
  3. Step 3: Cross multiply
    1,229.11x = 1,843.97 × 681.75
  4. Step 4: Simplify right side
    1,229.11x = 1,257,123.14
  5. Step 5: Solve for x
    x = 1,257,123.14/1,229.11
  6. Step 6: Final answer
    x = 1,022.79

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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.