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Finding the Third Proportional to 129,939 and 279,930

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Solution

The third proportional to 129,939 and 279,930 is: 603,058.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,939 : 279,930 = 279,930 : x
  2. Step 2: Convert to fraction form
    129,939/279,930 = 279,930/x
  3. Step 3: Cross multiply
    129,939x = 279,930 × 279,930
  4. Step 4: Simplify right side
    129,939x = 78,360,804,900
  5. Step 5: Solve for x
    x = 78,360,804,900/129,939
  6. Step 6: Final answer
    x = 603,058.40

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.