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Finding the Fourth Proportional to 161.19, 222.48 and 122.31

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Solution

The fourth proportional to 161.19, 222.48 and 122.31 is: 168.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.19 : 222.48 = 122.31 : x
  2. Step 2: Convert to fraction form
    161.19/222.48 = 122.31/x
  3. Step 3: Cross multiply
    161.19x = 222.48 × 122.31
  4. Step 4: Simplify right side
    161.19x = 27,211.53
  5. Step 5: Solve for x
    x = 27,211.53/161.19
  6. Step 6: Final answer
    x = 168.82

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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.