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Finding the Fourth Proportional to 238.78, 329.55 and 155.84

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Solution

The fourth proportional to 238.78, 329.55 and 155.84 is: 215.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.78 : 329.55 = 155.84 : x
  2. Step 2: Convert to fraction form
    238.78/329.55 = 155.84/x
  3. Step 3: Cross multiply
    238.78x = 329.55 × 155.84
  4. Step 4: Simplify right side
    238.78x = 51,357.07
  5. Step 5: Solve for x
    x = 51,357.07/238.78
  6. Step 6: Final answer
    x = 215.09

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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.