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Finding the Third Proportional to 312,855 and 687,918

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Solution

The third proportional to 312,855 and 687,918 is: 1,512,621.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,855 : 687,918 = 687,918 : x
  2. Step 2: Convert to fraction form
    312,855/687,918 = 687,918/x
  3. Step 3: Cross multiply
    312,855x = 687,918 × 687,918
  4. Step 4: Simplify right side
    312,855x = 473,231,174,724
  5. Step 5: Solve for x
    x = 473,231,174,724/312,855
  6. Step 6: Final answer
    x = 1,512,621.42

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.