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Finding the Third Proportional to 15,084 and 21,720

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Solution

The third proportional to 15,084 and 21,720 is: 31,275.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,084 : 21,720 = 21,720 : x
  2. Step 2: Convert to fraction form
    15,084/21,720 = 21,720/x
  3. Step 3: Cross multiply
    15,084x = 21,720 × 21,720
  4. Step 4: Simplify right side
    15,084x = 471,758,400
  5. Step 5: Solve for x
    x = 471,758,400/15,084
  6. Step 6: Final answer
    x = 31,275.42

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.