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Finding the Third Proportional to 104.20 and 119.39

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Solution

The third proportional to 104.20 and 119.39 is: 136.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.20 : 119.39 = 119.39 : x
  2. Step 2: Convert to fraction form
    104.20/119.39 = 119.39/x
  3. Step 3: Cross multiply
    104.20x = 119.39 × 119.39
  4. Step 4: Simplify right side
    104.20x = 14,254.12
  5. Step 5: Solve for x
    x = 14,254.12/104.20
  6. Step 6: Final answer
    x = 136.79

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.