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Finding the Fourth Proportional to 139.96, 193.14 and 81.74

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Solution

The fourth proportional to 139.96, 193.14 and 81.74 is: 112.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.96 : 193.14 = 81.74 : x
  2. Step 2: Convert to fraction form
    139.96/193.14 = 81.74/x
  3. Step 3: Cross multiply
    139.96x = 193.14 × 81.74
  4. Step 4: Simplify right side
    139.96x = 15,787.26
  5. Step 5: Solve for x
    x = 15,787.26/139.96
  6. Step 6: Final answer
    x = 112.80

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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.