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Finding the Fourth Proportional to 321.20, 443.26 and 196.86

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Solution

The fourth proportional to 321.20, 443.26 and 196.86 is: 271.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.20 : 443.26 = 196.86 : x
  2. Step 2: Convert to fraction form
    321.20/443.26 = 196.86/x
  3. Step 3: Cross multiply
    321.20x = 443.26 × 196.86
  4. Step 4: Simplify right side
    321.20x = 87,260.16
  5. Step 5: Solve for x
    x = 87,260.16/321.20
  6. Step 6: Final answer
    x = 271.67

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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.