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Finding the Third Proportional to 15,510 and 20,851

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Solution

The third proportional to 15,510 and 20,851 is: 28,031.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,510 : 20,851 = 20,851 : x
  2. Step 2: Convert to fraction form
    15,510/20,851 = 20,851/x
  3. Step 3: Cross multiply
    15,510x = 20,851 × 20,851
  4. Step 4: Simplify right side
    15,510x = 434,764,201
  5. Step 5: Solve for x
    x = 434,764,201/15,510
  6. Step 6: Final answer
    x = 28,031.22

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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.