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Finding the Third Proportional to 387,628 and 831,296

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Solution

The third proportional to 387,628 and 831,296 is: 1,782,773.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,628 : 831,296 = 831,296 : x
  2. Step 2: Convert to fraction form
    387,628/831,296 = 831,296/x
  3. Step 3: Cross multiply
    387,628x = 831,296 × 831,296
  4. Step 4: Simplify right side
    387,628x = 691,053,039,616
  5. Step 5: Solve for x
    x = 691,053,039,616/387,628
  6. Step 6: Final answer
    x = 1,782,773.79

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.