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Finding the Third Proportional to 280,636 and 421,274

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Solution

The third proportional to 280,636 and 421,274 is: 632,391.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,636 : 421,274 = 421,274 : x
  2. Step 2: Convert to fraction form
    280,636/421,274 = 421,274/x
  3. Step 3: Cross multiply
    280,636x = 421,274 × 421,274
  4. Step 4: Simplify right side
    280,636x = 177,471,783,076
  5. Step 5: Solve for x
    x = 177,471,783,076/280,636
  6. Step 6: Final answer
    x = 632,391.36

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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.