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Finding the Third Proportional to 275,836 and 421,777

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Solution

The third proportional to 275,836 and 421,777 is: 644,933.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,836 : 421,777 = 421,777 : x
  2. Step 2: Convert to fraction form
    275,836/421,777 = 421,777/x
  3. Step 3: Cross multiply
    275,836x = 421,777 × 421,777
  4. Step 4: Simplify right side
    275,836x = 177,895,837,729
  5. Step 5: Solve for x
    x = 177,895,837,729/275,836
  6. Step 6: Final answer
    x = 644,933.36

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.