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Finding the Third Proportional to 8,420 and 17,709

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Solution

The third proportional to 8,420 and 17,709 is: 37,245.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420 : 17,709 = 17,709 : x
  2. Step 2: Convert to fraction form
    8,420/17,709 = 17,709/x
  3. Step 3: Cross multiply
    8,420x = 17,709 × 17,709
  4. Step 4: Simplify right side
    8,420x = 313,608,681
  5. Step 5: Solve for x
    x = 313,608,681/8,420
  6. Step 6: Final answer
    x = 37,245.69

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.