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Finding the Third Proportional to 7,131 and 10,821

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Solution

The third proportional to 7,131 and 10,821 is: 16,420.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131 : 10,821 = 10,821 : x
  2. Step 2: Convert to fraction form
    7,131/10,821 = 10,821/x
  3. Step 3: Cross multiply
    7,131x = 10,821 × 10,821
  4. Step 4: Simplify right side
    7,131x = 117,094,041
  5. Step 5: Solve for x
    x = 117,094,041/7,131
  6. Step 6: Final answer
    x = 16,420.42

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.