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Finding the Third Proportional to 138,721 and 208,082

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Solution

The third proportional to 138,721 and 208,082 is: 312,123.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,721 : 208,082 = 208,082 : x
  2. Step 2: Convert to fraction form
    138,721/208,082 = 208,082/x
  3. Step 3: Cross multiply
    138,721x = 208,082 × 208,082
  4. Step 4: Simplify right side
    138,721x = 43,298,118,724
  5. Step 5: Solve for x
    x = 43,298,118,724/138,721
  6. Step 6: Final answer
    x = 312,123.75

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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.