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Finding the Fourth Proportional to 321.34, 443.02 and 216.46

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Solution

The fourth proportional to 321.34, 443.02 and 216.46 is: 298.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.34 : 443.02 = 216.46 : x
  2. Step 2: Convert to fraction form
    321.34/443.02 = 216.46/x
  3. Step 3: Cross multiply
    321.34x = 443.02 × 216.46
  4. Step 4: Simplify right side
    321.34x = 95,896.11
  5. Step 5: Solve for x
    x = 95,896.11/321.34
  6. Step 6: Final answer
    x = 298.43

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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.