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Finding the Fourth Proportional to 161.70, 222.92 and 122.38

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Solution

The fourth proportional to 161.70, 222.92 and 122.38 is: 168.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.70 : 222.92 = 122.38 : x
  2. Step 2: Convert to fraction form
    161.70/222.92 = 122.38/x
  3. Step 3: Cross multiply
    161.70x = 222.92 × 122.38
  4. Step 4: Simplify right side
    161.70x = 27,280.24
  5. Step 5: Solve for x
    x = 27,280.24/161.70
  6. Step 6: Final answer
    x = 168.71

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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.