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Finding the Fourth Proportional to 321.60, 443.79 and 203.61

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Solution

The fourth proportional to 321.60, 443.79 and 203.61 is: 280.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.60 : 443.79 = 203.61 : x
  2. Step 2: Convert to fraction form
    321.60/443.79 = 203.61/x
  3. Step 3: Cross multiply
    321.60x = 443.79 × 203.61
  4. Step 4: Simplify right side
    321.60x = 90,360.08
  5. Step 5: Solve for x
    x = 90,360.08/321.60
  6. Step 6: Final answer
    x = 280.97

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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.