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Finding the Fourth Proportional to 1,079.11, 1,489.78 and 865.87

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Solution

The fourth proportional to 1,079.11, 1,489.78 and 865.87 is: 1,195.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.11 : 1,489.78 = 865.87 : x
  2. Step 2: Convert to fraction form
    1,079.11/1,489.78 = 865.87/x
  3. Step 3: Cross multiply
    1,079.11x = 1,489.78 × 865.87
  4. Step 4: Simplify right side
    1,079.11x = 1,289,956.68
  5. Step 5: Solve for x
    x = 1,289,956.68/1,079.11
  6. Step 6: Final answer
    x = 1,195.39

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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.