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Finding the Third Proportional to 11,720 and 21,778

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Solution

The third proportional to 11,720 and 21,778 is: 40,467.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,720 : 21,778 = 21,778 : x
  2. Step 2: Convert to fraction form
    11,720/21,778 = 21,778/x
  3. Step 3: Cross multiply
    11,720x = 21,778 × 21,778
  4. Step 4: Simplify right side
    11,720x = 474,281,284
  5. Step 5: Solve for x
    x = 474,281,284/11,720
  6. Step 6: Final answer
    x = 40,467.69

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.