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Finding the Third Proportional to 239,211 and 515,286

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Solution

The third proportional to 239,211 and 515,286 is: 1,109,980.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,211 : 515,286 = 515,286 : x
  2. Step 2: Convert to fraction form
    239,211/515,286 = 515,286/x
  3. Step 3: Cross multiply
    239,211x = 515,286 × 515,286
  4. Step 4: Simplify right side
    239,211x = 265,519,661,796
  5. Step 5: Solve for x
    x = 265,519,661,796/239,211
  6. Step 6: Final answer
    x = 1,109,980.99

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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.