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Finding the Third Proportional to 307,908 and 640,305

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Solution

The third proportional to 307,908 and 640,305 is: 1,331,535.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,908 : 640,305 = 640,305 : x
  2. Step 2: Convert to fraction form
    307,908/640,305 = 640,305/x
  3. Step 3: Cross multiply
    307,908x = 640,305 × 640,305
  4. Step 4: Simplify right side
    307,908x = 409,990,493,025
  5. Step 5: Solve for x
    x = 409,990,493,025/307,908
  6. Step 6: Final answer
    x = 1,331,535.70

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.