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Finding the Fourth Proportional to 321.96, 443.28 and 280.44

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Solution

The fourth proportional to 321.96, 443.28 and 280.44 is: 386.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.96 : 443.28 = 280.44 : x
  2. Step 2: Convert to fraction form
    321.96/443.28 = 280.44/x
  3. Step 3: Cross multiply
    321.96x = 443.28 × 280.44
  4. Step 4: Simplify right side
    321.96x = 124,313.44
  5. Step 5: Solve for x
    x = 124,313.44/321.96
  6. Step 6: Final answer
    x = 386.11

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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.