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Finding the Third Proportional to 89,742 and 138,939

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Solution

The third proportional to 89,742 and 138,939 is: 215,106.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,742 : 138,939 = 138,939 : x
  2. Step 2: Convert to fraction form
    89,742/138,939 = 138,939/x
  3. Step 3: Cross multiply
    89,742x = 138,939 × 138,939
  4. Step 4: Simplify right side
    89,742x = 19,304,045,721
  5. Step 5: Solve for x
    x = 19,304,045,721/89,742
  6. Step 6: Final answer
    x = 215,106.03

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.