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Finding the Third Proportional to 15,516 and 20,813

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Solution

The third proportional to 15,516 and 20,813 is: 27,918.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,516 : 20,813 = 20,813 : x
  2. Step 2: Convert to fraction form
    15,516/20,813 = 20,813/x
  3. Step 3: Cross multiply
    15,516x = 20,813 × 20,813
  4. Step 4: Simplify right side
    15,516x = 433,180,969
  5. Step 5: Solve for x
    x = 433,180,969/15,516
  6. Step 6: Final answer
    x = 27,918.34

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.