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Finding the Third Proportional to 1,912.13 and 4,212.38

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Solution

The third proportional to 1,912.13 and 4,212.38 is: 9,279.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.13 : 4,212.38 = 4,212.38 : x
  2. Step 2: Convert to fraction form
    1,912.13/4,212.38 = 4,212.38/x
  3. Step 3: Cross multiply
    1,912.13x = 4,212.38 × 4,212.38
  4. Step 4: Simplify right side
    1,912.13x = 17,744,103.14
  5. Step 5: Solve for x
    x = 17,744,103.14/1,912.13
  6. Step 6: Final answer
    x = 9,279.78

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.