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Finding the Third Proportional to 385,274 and 511,214

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Solution

The third proportional to 385,274 and 511,214 is: 678,321.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,274 : 511,214 = 511,214 : x
  2. Step 2: Convert to fraction form
    385,274/511,214 = 511,214/x
  3. Step 3: Cross multiply
    385,274x = 511,214 × 511,214
  4. Step 4: Simplify right side
    385,274x = 261,339,753,796
  5. Step 5: Solve for x
    x = 261,339,753,796/385,274
  6. Step 6: Final answer
    x = 678,321.80

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.