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Finding the Fourth Proportional to 140.97, 194.55 and 78.80

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Solution

The fourth proportional to 140.97, 194.55 and 78.80 is: 108.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.97 : 194.55 = 78.80 : x
  2. Step 2: Convert to fraction form
    140.97/194.55 = 78.80/x
  3. Step 3: Cross multiply
    140.97x = 194.55 × 78.80
  4. Step 4: Simplify right side
    140.97x = 15,330.54
  5. Step 5: Solve for x
    x = 15,330.54/140.97
  6. Step 6: Final answer
    x = 108.75

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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.