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Finding the Fourth Proportional to 161.97, 243.05 and 85.11

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Solution

The fourth proportional to 161.97, 243.05 and 85.11 is: 127.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.97 : 243.05 = 85.11 : x
  2. Step 2: Convert to fraction form
    161.97/243.05 = 85.11/x
  3. Step 3: Cross multiply
    161.97x = 243.05 × 85.11
  4. Step 4: Simplify right side
    161.97x = 20,685.56
  5. Step 5: Solve for x
    x = 20,685.56/161.97
  6. Step 6: Final answer
    x = 127.71

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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.