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Finding the Fourth Proportional to 321.39, 481.78 and 115.92

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Solution

The fourth proportional to 321.39, 481.78 and 115.92 is: 173.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.39 : 481.78 = 115.92 : x
  2. Step 2: Convert to fraction form
    321.39/481.78 = 115.92/x
  3. Step 3: Cross multiply
    321.39x = 481.78 × 115.92
  4. Step 4: Simplify right side
    321.39x = 55,847.94
  5. Step 5: Solve for x
    x = 55,847.94/321.39
  6. Step 6: Final answer
    x = 173.77

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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.