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Finding the Third Proportional to 3,915 and 8,620

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Solution

The third proportional to 3,915 and 8,620 is: 18,979.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915 : 8,620 = 8,620 : x
  2. Step 2: Convert to fraction form
    3,915/8,620 = 8,620/x
  3. Step 3: Cross multiply
    3,915x = 8,620 × 8,620
  4. Step 4: Simplify right side
    3,915x = 74,304,400
  5. Step 5: Solve for x
    x = 74,304,400/3,915
  6. Step 6: Final answer
    x = 18,979.41

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.