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Finding the Fourth Proportional to 139.28, 191.84 and 122.94

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Solution

The fourth proportional to 139.28, 191.84 and 122.94 is: 169.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.28 : 191.84 = 122.94 : x
  2. Step 2: Convert to fraction form
    139.28/191.84 = 122.94/x
  3. Step 3: Cross multiply
    139.28x = 191.84 × 122.94
  4. Step 4: Simplify right side
    139.28x = 23,584.19
  5. Step 5: Solve for x
    x = 23,584.19/139.28
  6. Step 6: Final answer
    x = 169.34

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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.