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Finding the Fourth Proportional to 138.37, 207.42 and 126.49

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Solution

The fourth proportional to 138.37, 207.42 and 126.49 is: 189.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.37 : 207.42 = 126.49 : x
  2. Step 2: Convert to fraction form
    138.37/207.42 = 126.49/x
  3. Step 3: Cross multiply
    138.37x = 207.42 × 126.49
  4. Step 4: Simplify right side
    138.37x = 26,236.56
  5. Step 5: Solve for x
    x = 26,236.56/138.37
  6. Step 6: Final answer
    x = 189.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.