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Finding the Fourth Proportional to 1,321.11, 1,821.78 and 796.86

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Solution

The fourth proportional to 1,321.11, 1,821.78 and 796.86 is: 1,098.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.11 : 1,821.78 = 796.86 : x
  2. Step 2: Convert to fraction form
    1,321.11/1,821.78 = 796.86/x
  3. Step 3: Cross multiply
    1,321.11x = 1,821.78 × 796.86
  4. Step 4: Simplify right side
    1,321.11x = 1,451,703.61
  5. Step 5: Solve for x
    x = 1,451,703.61/1,321.11
  6. Step 6: Final answer
    x = 1,098.85

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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.