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Finding the Third Proportional to 6,912 and 11,120

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Solution

The third proportional to 6,912 and 11,120 is: 17,889.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,912 : 11,120 = 11,120 : x
  2. Step 2: Convert to fraction form
    6,912/11,120 = 11,120/x
  3. Step 3: Cross multiply
    6,912x = 11,120 × 11,120
  4. Step 4: Simplify right side
    6,912x = 123,654,400
  5. Step 5: Solve for x
    x = 123,654,400/6,912
  6. Step 6: Final answer
    x = 17,889.81

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.