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Finding the Fourth Proportional to 138.71, 191.63 and 122.24

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Solution

The fourth proportional to 138.71, 191.63 and 122.24 is: 168.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.71 : 191.63 = 122.24 : x
  2. Step 2: Convert to fraction form
    138.71/191.63 = 122.24/x
  3. Step 3: Cross multiply
    138.71x = 191.63 × 122.24
  4. Step 4: Simplify right side
    138.71x = 23,424.85
  5. Step 5: Solve for x
    x = 23,424.85/138.71
  6. Step 6: Final answer
    x = 168.88

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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.