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Finding the Third Proportional to 281,418 and 421,638

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Solution

The third proportional to 281,418 and 421,638 is: 631,724.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,418 : 421,638 = 421,638 : x
  2. Step 2: Convert to fraction form
    281,418/421,638 = 421,638/x
  3. Step 3: Cross multiply
    281,418x = 421,638 × 421,638
  4. Step 4: Simplify right side
    281,418x = 177,778,603,044
  5. Step 5: Solve for x
    x = 177,778,603,044/281,418
  6. Step 6: Final answer
    x = 631,724.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.