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Finding the Third Proportional to 13,455 and 20,187

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Solution

The third proportional to 13,455 and 20,187 is: 30,287.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,455 : 20,187 = 20,187 : x
  2. Step 2: Convert to fraction form
    13,455/20,187 = 20,187/x
  3. Step 3: Cross multiply
    13,455x = 20,187 × 20,187
  4. Step 4: Simplify right side
    13,455x = 407,514,969
  5. Step 5: Solve for x
    x = 407,514,969/13,455
  6. Step 6: Final answer
    x = 30,287.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.