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Finding the Third Proportional to 138,722 and 209,542

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Solution

The third proportional to 138,722 and 209,542 is: 316,516.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,722 : 209,542 = 209,542 : x
  2. Step 2: Convert to fraction form
    138,722/209,542 = 209,542/x
  3. Step 3: Cross multiply
    138,722x = 209,542 × 209,542
  4. Step 4: Simplify right side
    138,722x = 43,907,849,764
  5. Step 5: Solve for x
    x = 43,907,849,764/138,722
  6. Step 6: Final answer
    x = 316,516.84

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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.