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Finding the Third Proportional to 7,679 and 11,865

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Solution

The third proportional to 7,679 and 11,865 is: 18,332.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,679 : 11,865 = 11,865 : x
  2. Step 2: Convert to fraction form
    7,679/11,865 = 11,865/x
  3. Step 3: Cross multiply
    7,679x = 11,865 × 11,865
  4. Step 4: Simplify right side
    7,679x = 140,778,225
  5. Step 5: Solve for x
    x = 140,778,225/7,679
  6. Step 6: Final answer
    x = 18,332.89

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.