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Finding the Third Proportional to 313,870 and 686,424

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Solution

The third proportional to 313,870 and 686,424 is: 1,501,188.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,870 : 686,424 = 686,424 : x
  2. Step 2: Convert to fraction form
    313,870/686,424 = 686,424/x
  3. Step 3: Cross multiply
    313,870x = 686,424 × 686,424
  4. Step 4: Simplify right side
    313,870x = 471,177,907,776
  5. Step 5: Solve for x
    x = 471,177,907,776/313,870
  6. Step 6: Final answer
    x = 1,501,188.10

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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.