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Finding the Fourth Proportional to 139.06, 191.79 and 107.92

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Solution

The fourth proportional to 139.06, 191.79 and 107.92 is: 148.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.06 : 191.79 = 107.92 : x
  2. Step 2: Convert to fraction form
    139.06/191.79 = 107.92/x
  3. Step 3: Cross multiply
    139.06x = 191.79 × 107.92
  4. Step 4: Simplify right side
    139.06x = 20,697.98
  5. Step 5: Solve for x
    x = 20,697.98/139.06
  6. Step 6: Final answer
    x = 148.84

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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.