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Finding the Third Proportional to 317,538 and 686,268

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Solution

The third proportional to 317,538 and 686,268 is: 1,483,172.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,538 : 686,268 = 686,268 : x
  2. Step 2: Convert to fraction form
    317,538/686,268 = 686,268/x
  3. Step 3: Cross multiply
    317,538x = 686,268 × 686,268
  4. Step 4: Simplify right side
    317,538x = 470,963,767,824
  5. Step 5: Solve for x
    x = 470,963,767,824/317,538
  6. Step 6: Final answer
    x = 1,483,172.94

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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.