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Finding the Fourth Proportional to 161.38, 222.31 and 153.15

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Solution

The fourth proportional to 161.38, 222.31 and 153.15 is: 210.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.38 : 222.31 = 153.15 : x
  2. Step 2: Convert to fraction form
    161.38/222.31 = 153.15/x
  3. Step 3: Cross multiply
    161.38x = 222.31 × 153.15
  4. Step 4: Simplify right side
    161.38x = 34,046.78
  5. Step 5: Solve for x
    x = 34,046.78/161.38
  6. Step 6: Final answer
    x = 210.97

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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.