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Finding the Fourth Proportional to 238.78, 329.57 and 140.57

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Solution

The fourth proportional to 238.78, 329.57 and 140.57 is: 194.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.78 : 329.57 = 140.57 : x
  2. Step 2: Convert to fraction form
    238.78/329.57 = 140.57/x
  3. Step 3: Cross multiply
    238.78x = 329.57 × 140.57
  4. Step 4: Simplify right side
    238.78x = 46,327.07
  5. Step 5: Solve for x
    x = 46,327.07/238.78
  6. Step 6: Final answer
    x = 194.01

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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.