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Finding the Third Proportional to 414,406 and 639,915

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Solution

The third proportional to 414,406 and 639,915 is: 988,140.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    414,406 : 639,915 = 639,915 : x
  2. Step 2: Convert to fraction form
    414,406/639,915 = 639,915/x
  3. Step 3: Cross multiply
    414,406x = 639,915 × 639,915
  4. Step 4: Simplify right side
    414,406x = 409,491,207,225
  5. Step 5: Solve for x
    x = 409,491,207,225/414,406
  6. Step 6: Final answer
    x = 988,140.15

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.