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Finding the Fourth Proportional to 238.78, 329.25 and 155.78

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Solution

The fourth proportional to 238.78, 329.25 and 155.78 is: 214.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.78 : 329.25 = 155.78 : x
  2. Step 2: Convert to fraction form
    238.78/329.25 = 155.78/x
  3. Step 3: Cross multiply
    238.78x = 329.25 × 155.78
  4. Step 4: Simplify right side
    238.78x = 51,290.57
  5. Step 5: Solve for x
    x = 51,290.57/238.78
  6. Step 6: Final answer
    x = 214.80

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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.