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Finding the Third Proportional to 138,619 and 208,914

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Solution

The third proportional to 138,619 and 208,914 is: 314,856.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,619 : 208,914 = 208,914 : x
  2. Step 2: Convert to fraction form
    138,619/208,914 = 208,914/x
  3. Step 3: Cross multiply
    138,619x = 208,914 × 208,914
  4. Step 4: Simplify right side
    138,619x = 43,645,059,396
  5. Step 5: Solve for x
    x = 43,645,059,396/138,619
  6. Step 6: Final answer
    x = 314,856.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.