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Finding the Third Proportional to 12,699 and 20,187

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Solution

The third proportional to 12,699 and 20,187 is: 32,090.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,699 : 20,187 = 20,187 : x
  2. Step 2: Convert to fraction form
    12,699/20,187 = 20,187/x
  3. Step 3: Cross multiply
    12,699x = 20,187 × 20,187
  4. Step 4: Simplify right side
    12,699x = 407,514,969
  5. Step 5: Solve for x
    x = 407,514,969/12,699
  6. Step 6: Final answer
    x = 32,090.32

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.