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Finding the Third Proportional to 7,728 and 18,216

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Solution

The third proportional to 7,728 and 18,216 is: 42,937.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,728 : 18,216 = 18,216 : x
  2. Step 2: Convert to fraction form
    7,728/18,216 = 18,216/x
  3. Step 3: Cross multiply
    7,728x = 18,216 × 18,216
  4. Step 4: Simplify right side
    7,728x = 331,822,656
  5. Step 5: Solve for x
    x = 331,822,656/7,728
  6. Step 6: Final answer
    x = 42,937.71

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.