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Finding the Third Proportional to 12,156.75 and 21,579.75

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Solution

The third proportional to 12,156.75 and 21,579.75 is: 38,306.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,156.75 : 21,579.75 = 21,579.75 : x
  2. Step 2: Convert to fraction form
    12,156.75/21,579.75 = 21,579.75/x
  3. Step 3: Cross multiply
    12,156.75x = 21,579.75 × 21,579.75
  4. Step 4: Simplify right side
    12,156.75x = 465,685,610.06
  5. Step 5: Solve for x
    x = 465,685,610.06/12,156.75
  6. Step 6: Final answer
    x = 38,306.75

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.