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Finding the Third Proportional to 280,761 and 421,005

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Solution

The third proportional to 280,761 and 421,005 is: 631,302.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,761 : 421,005 = 421,005 : x
  2. Step 2: Convert to fraction form
    280,761/421,005 = 421,005/x
  3. Step 3: Cross multiply
    280,761x = 421,005 × 421,005
  4. Step 4: Simplify right side
    280,761x = 177,245,210,025
  5. Step 5: Solve for x
    x = 177,245,210,025/280,761
  6. Step 6: Final answer
    x = 631,302.82

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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.