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Finding the Fourth Proportional to 139.19, 191.87 and 119.42

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Solution

The fourth proportional to 139.19, 191.87 and 119.42 is: 164.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.19 : 191.87 = 119.42 : x
  2. Step 2: Convert to fraction form
    139.19/191.87 = 119.42/x
  3. Step 3: Cross multiply
    139.19x = 191.87 × 119.42
  4. Step 4: Simplify right side
    139.19x = 22,912.73
  5. Step 5: Solve for x
    x = 22,912.73/139.19
  6. Step 6: Final answer
    x = 164.62

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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.