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Finding the Fourth Proportional to 549.18, 821.34 and 331.29

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Solution

The fourth proportional to 549.18, 821.34 and 331.29 is: 495.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.18 : 821.34 = 331.29 : x
  2. Step 2: Convert to fraction form
    549.18/821.34 = 331.29/x
  3. Step 3: Cross multiply
    549.18x = 821.34 × 331.29
  4. Step 4: Simplify right side
    549.18x = 272,101.73
  5. Step 5: Solve for x
    x = 272,101.73/549.18
  6. Step 6: Final answer
    x = 495.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.