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Finding the Fourth Proportional to 138.26, 207.39 and 126.14

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Solution

The fourth proportional to 138.26, 207.39 and 126.14 is: 189.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.26 : 207.39 = 126.14 : x
  2. Step 2: Convert to fraction form
    138.26/207.39 = 126.14/x
  3. Step 3: Cross multiply
    138.26x = 207.39 × 126.14
  4. Step 4: Simplify right side
    138.26x = 26,160.17
  5. Step 5: Solve for x
    x = 26,160.17/138.26
  6. Step 6: Final answer
    x = 189.21

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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.