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Finding the Fourth Proportional to 238.96, 329.68 and 140.72

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Solution

The fourth proportional to 238.96, 329.68 and 140.72 is: 194.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.96 : 329.68 = 140.72 : x
  2. Step 2: Convert to fraction form
    238.96/329.68 = 140.72/x
  3. Step 3: Cross multiply
    238.96x = 329.68 × 140.72
  4. Step 4: Simplify right side
    238.96x = 46,392.57
  5. Step 5: Solve for x
    x = 46,392.57/238.96
  6. Step 6: Final answer
    x = 194.14

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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.