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Finding the Third Proportional to 9,128 and 11,900

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Solution

The third proportional to 9,128 and 11,900 is: 15,513.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,128 : 11,900 = 11,900 : x
  2. Step 2: Convert to fraction form
    9,128/11,900 = 11,900/x
  3. Step 3: Cross multiply
    9,128x = 11,900 × 11,900
  4. Step 4: Simplify right side
    9,128x = 141,610,000
  5. Step 5: Solve for x
    x = 141,610,000/9,128
  6. Step 6: Final answer
    x = 15,513.80

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.