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Finding the Fourth Proportional to 238.86, 329.70 and 161.28

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Solution

The fourth proportional to 238.86, 329.70 and 161.28 is: 222.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.86 : 329.70 = 161.28 : x
  2. Step 2: Convert to fraction form
    238.86/329.70 = 161.28/x
  3. Step 3: Cross multiply
    238.86x = 329.70 × 161.28
  4. Step 4: Simplify right side
    238.86x = 53,174.02
  5. Step 5: Solve for x
    x = 53,174.02/238.86
  6. Step 6: Final answer
    x = 222.62

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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.