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Finding the Fourth Proportional to 140.40, 193.78 and 82.20

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Solution

The fourth proportional to 140.40, 193.78 and 82.20 is: 113.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.40 : 193.78 = 82.20 : x
  2. Step 2: Convert to fraction form
    140.40/193.78 = 82.20/x
  3. Step 3: Cross multiply
    140.40x = 193.78 × 82.20
  4. Step 4: Simplify right side
    140.40x = 15,928.72
  5. Step 5: Solve for x
    x = 15,928.72/140.40
  6. Step 6: Final answer
    x = 113.45

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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.