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Finding the Fourth Proportional to 213.87, 321.17 and 161.83

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Solution

The fourth proportional to 213.87, 321.17 and 161.83 is: 243.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.87 : 321.17 = 161.83 : x
  2. Step 2: Convert to fraction form
    213.87/321.17 = 161.83/x
  3. Step 3: Cross multiply
    213.87x = 321.17 × 161.83
  4. Step 4: Simplify right side
    213.87x = 51,974.53
  5. Step 5: Solve for x
    x = 51,974.53/213.87
  6. Step 6: Final answer
    x = 243.02

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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.