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Finding the Third Proportional to 11,154 and 15,515

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Solution

The third proportional to 11,154 and 15,515 is: 21,581.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,154 : 15,515 = 15,515 : x
  2. Step 2: Convert to fraction form
    11,154/15,515 = 15,515/x
  3. Step 3: Cross multiply
    11,154x = 15,515 × 15,515
  4. Step 4: Simplify right side
    11,154x = 240,715,225
  5. Step 5: Solve for x
    x = 240,715,225/11,154
  6. Step 6: Final answer
    x = 21,581.07

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.