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Finding the Third Proportional to 13,115 and 20,778

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Solution

The third proportional to 13,115 and 20,778 is: 32,918.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,115 : 20,778 = 20,778 : x
  2. Step 2: Convert to fraction form
    13,115/20,778 = 20,778/x
  3. Step 3: Cross multiply
    13,115x = 20,778 × 20,778
  4. Step 4: Simplify right side
    13,115x = 431,725,284
  5. Step 5: Solve for x
    x = 431,725,284/13,115
  6. Step 6: Final answer
    x = 32,918.44

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.