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Finding the Third Proportional to 317,330 and 686,908

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Solution

The third proportional to 317,330 and 686,908 is: 1,486,914.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,330 : 686,908 = 686,908 : x
  2. Step 2: Convert to fraction form
    317,330/686,908 = 686,908/x
  3. Step 3: Cross multiply
    317,330x = 686,908 × 686,908
  4. Step 4: Simplify right side
    317,330x = 471,842,600,464
  5. Step 5: Solve for x
    x = 471,842,600,464/317,330
  6. Step 6: Final answer
    x = 1,486,914.57

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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.