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Finding the Third Proportional to 385,290 and 511,241

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Solution

The third proportional to 385,290 and 511,241 is: 678,365.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,290 : 511,241 = 511,241 : x
  2. Step 2: Convert to fraction form
    385,290/511,241 = 511,241/x
  3. Step 3: Cross multiply
    385,290x = 511,241 × 511,241
  4. Step 4: Simplify right side
    385,290x = 261,367,360,081
  5. Step 5: Solve for x
    x = 261,367,360,081/385,290
  6. Step 6: Final answer
    x = 678,365.28

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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.