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Finding the Fourth Proportional to 140.41, 193.73 and 81.39

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Solution

The fourth proportional to 140.41, 193.73 and 81.39 is: 112.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.41 : 193.73 = 81.39 : x
  2. Step 2: Convert to fraction form
    140.41/193.73 = 81.39/x
  3. Step 3: Cross multiply
    140.41x = 193.73 × 81.39
  4. Step 4: Simplify right side
    140.41x = 15,767.68
  5. Step 5: Solve for x
    x = 15,767.68/140.41
  6. Step 6: Final answer
    x = 112.30

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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.