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Finding the Third Proportional to 315,422 and 681,388

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Solution

The third proportional to 315,422 and 681,388 is: 1,471,963.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,422 : 681,388 = 681,388 : x
  2. Step 2: Convert to fraction form
    315,422/681,388 = 681,388/x
  3. Step 3: Cross multiply
    315,422x = 681,388 × 681,388
  4. Step 4: Simplify right side
    315,422x = 464,289,606,544
  5. Step 5: Solve for x
    x = 464,289,606,544/315,422
  6. Step 6: Final answer
    x = 1,471,963.30

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.