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Finding the Third Proportional to 12,172 and 15,984

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Solution

The third proportional to 12,172 and 15,984 is: 20,989.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,172 : 15,984 = 15,984 : x
  2. Step 2: Convert to fraction form
    12,172/15,984 = 15,984/x
  3. Step 3: Cross multiply
    12,172x = 15,984 × 15,984
  4. Step 4: Simplify right side
    12,172x = 255,488,256
  5. Step 5: Solve for x
    x = 255,488,256/12,172
  6. Step 6: Final answer
    x = 20,989.83

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.