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Finding the Third Proportional to 313,908 and 687,140

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Solution

The third proportional to 313,908 and 687,140 is: 1,504,139.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,908 : 687,140 = 687,140 : x
  2. Step 2: Convert to fraction form
    313,908/687,140 = 687,140/x
  3. Step 3: Cross multiply
    313,908x = 687,140 × 687,140
  4. Step 4: Simplify right side
    313,908x = 472,161,379,600
  5. Step 5: Solve for x
    x = 472,161,379,600/313,908
  6. Step 6: Final answer
    x = 1,504,139.36

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.