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Finding the Fourth Proportional to 238.78, 329.65 and 180.46

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Solution

The fourth proportional to 238.78, 329.65 and 180.46 is: 249.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.78 : 329.65 = 180.46 : x
  2. Step 2: Convert to fraction form
    238.78/329.65 = 180.46/x
  3. Step 3: Cross multiply
    238.78x = 329.65 × 180.46
  4. Step 4: Simplify right side
    238.78x = 59,489.62
  5. Step 5: Solve for x
    x = 59,489.62/238.78
  6. Step 6: Final answer
    x = 249.14

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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.