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Finding the Third Proportional to 330,978 and 511,446

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Solution

The third proportional to 330,978 and 511,446 is: 790,315.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,978 : 511,446 = 511,446 : x
  2. Step 2: Convert to fraction form
    330,978/511,446 = 511,446/x
  3. Step 3: Cross multiply
    330,978x = 511,446 × 511,446
  4. Step 4: Simplify right side
    330,978x = 261,577,010,916
  5. Step 5: Solve for x
    x = 261,577,010,916/330,978
  6. Step 6: Final answer
    x = 790,315.40

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