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Finding the Fourth Proportional to 238.80, 329.52 and 221.38

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Solution

The fourth proportional to 238.80, 329.52 and 221.38 is: 305.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.80 : 329.52 = 221.38 : x
  2. Step 2: Convert to fraction form
    238.80/329.52 = 221.38/x
  3. Step 3: Cross multiply
    238.80x = 329.52 × 221.38
  4. Step 4: Simplify right side
    238.80x = 72,949.14
  5. Step 5: Solve for x
    x = 72,949.14/238.80
  6. Step 6: Final answer
    x = 305.48

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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.