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Finding the Third Proportional to 279,984 and 421,416

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Solution

The third proportional to 279,984 and 421,416 is: 634,291.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,984 : 421,416 = 421,416 : x
  2. Step 2: Convert to fraction form
    279,984/421,416 = 421,416/x
  3. Step 3: Cross multiply
    279,984x = 421,416 × 421,416
  4. Step 4: Simplify right side
    279,984x = 177,591,445,056
  5. Step 5: Solve for x
    x = 177,591,445,056/279,984
  6. Step 6: Final answer
    x = 634,291.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.