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Finding the Third Proportional to 275,863 and 421,813

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Solution

The third proportional to 275,863 and 421,813 is: 644,980.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,863 : 421,813 = 421,813 : x
  2. Step 2: Convert to fraction form
    275,863/421,813 = 421,813/x
  3. Step 3: Cross multiply
    275,863x = 421,813 × 421,813
  4. Step 4: Simplify right side
    275,863x = 177,926,206,969
  5. Step 5: Solve for x
    x = 177,926,206,969/275,863
  6. Step 6: Final answer
    x = 644,980.32

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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.