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Finding the Third Proportional to 401,938 and 639,805

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Solution

The third proportional to 401,938 and 639,805 is: 1,018,441.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    401,938 : 639,805 = 639,805 : x
  2. Step 2: Convert to fraction form
    401,938/639,805 = 639,805/x
  3. Step 3: Cross multiply
    401,938x = 639,805 × 639,805
  4. Step 4: Simplify right side
    401,938x = 409,350,438,025
  5. Step 5: Solve for x
    x = 409,350,438,025/401,938
  6. Step 6: Final answer
    x = 1,018,441.74

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.