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Finding the Third Proportional to 15,331.50 and 21,699

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Solution

The third proportional to 15,331.50 and 21,699 is: 30,711.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,331.50 : 21,699 = 21,699 : x
  2. Step 2: Convert to fraction form
    15,331.50/21,699 = 21,699/x
  3. Step 3: Cross multiply
    15,331.50x = 21,699 × 21,699
  4. Step 4: Simplify right side
    15,331.50x = 470,846,601
  5. Step 5: Solve for x
    x = 470,846,601/15,331.50
  6. Step 6: Final answer
    x = 30,711.06

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.