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Finding the Fourth Proportional to 321.19, 481.66 and 115.72

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Solution

The fourth proportional to 321.19, 481.66 and 115.72 is: 173.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.19 : 481.66 = 115.72 : x
  2. Step 2: Convert to fraction form
    321.19/481.66 = 115.72/x
  3. Step 3: Cross multiply
    321.19x = 481.66 × 115.72
  4. Step 4: Simplify right side
    321.19x = 55,737.70
  5. Step 5: Solve for x
    x = 55,737.70/321.19
  6. Step 6: Final answer
    x = 173.53

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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.