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Finding the Fourth Proportional to 139.20, 191.96 and 83.94

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Solution

The fourth proportional to 139.20, 191.96 and 83.94 is: 115.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.20 : 191.96 = 83.94 : x
  2. Step 2: Convert to fraction form
    139.20/191.96 = 83.94/x
  3. Step 3: Cross multiply
    139.20x = 191.96 × 83.94
  4. Step 4: Simplify right side
    139.20x = 16,113.12
  5. Step 5: Solve for x
    x = 16,113.12/139.20
  6. Step 6: Final answer
    x = 115.76

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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.