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Finding the Third Proportional to 309,631.78 and 640,500.75

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Solution

The third proportional to 309,631.78 and 640,500.75 is: 1,324,932.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,631.78 : 640,500.75 = 640,500.75 : x
  2. Step 2: Convert to fraction form
    309,631.78/640,500.75 = 640,500.75/x
  3. Step 3: Cross multiply
    309,631.78x = 640,500.75 × 640,500.75
  4. Step 4: Simplify right side
    309,631.78x = 410,241,210,750.56
  5. Step 5: Solve for x
    x = 410,241,210,750.56/309,631.78
  6. Step 6: Final answer
    x = 1,324,932.50

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.