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Finding the Fourth Proportional to 1,191.39, 1,789.13 and 731.87

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Solution

The fourth proportional to 1,191.39, 1,789.13 and 731.87 is: 1,099.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.39 : 1,789.13 = 731.87 : x
  2. Step 2: Convert to fraction form
    1,191.39/1,789.13 = 731.87/x
  3. Step 3: Cross multiply
    1,191.39x = 1,789.13 × 731.87
  4. Step 4: Simplify right side
    1,191.39x = 1,309,410.57
  5. Step 5: Solve for x
    x = 1,309,410.57/1,191.39
  6. Step 6: Final answer
    x = 1,099.06

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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.