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Finding the Fourth Proportional to 321.20, 443.12 and 203.12

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Solution

The fourth proportional to 321.20, 443.12 and 203.12 is: 280.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.20 : 443.12 = 203.12 : x
  2. Step 2: Convert to fraction form
    321.20/443.12 = 203.12/x
  3. Step 3: Cross multiply
    321.20x = 443.12 × 203.12
  4. Step 4: Simplify right side
    321.20x = 90,005.52
  5. Step 5: Solve for x
    x = 90,005.52/321.20
  6. Step 6: Final answer
    x = 280.22

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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.