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Finding the Fourth Proportional to 793.92, 1,192.86 and 691.86

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Solution

The fourth proportional to 793.92, 1,192.86 and 691.86 is: 1,039.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.92 : 1,192.86 = 691.86 : x
  2. Step 2: Convert to fraction form
    793.92/1,192.86 = 691.86/x
  3. Step 3: Cross multiply
    793.92x = 1,192.86 × 691.86
  4. Step 4: Simplify right side
    793.92x = 825,292.12
  5. Step 5: Solve for x
    x = 825,292.12/793.92
  6. Step 6: Final answer
    x = 1,039.52

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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.