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Finding the Fourth Proportional to 138.70, 208.40 and 126.06

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Solution

The fourth proportional to 138.70, 208.40 and 126.06 is: 189.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.70 : 208.40 = 126.06 : x
  2. Step 2: Convert to fraction form
    138.70/208.40 = 126.06/x
  3. Step 3: Cross multiply
    138.70x = 208.40 × 126.06
  4. Step 4: Simplify right side
    138.70x = 26,270.27
  5. Step 5: Solve for x
    x = 26,270.27/138.70
  6. Step 6: Final answer
    x = 189.41

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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.