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Finding the Third Proportional to 15,624 and 18,396

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Solution

The third proportional to 15,624 and 18,396 is: 21,659.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,624 : 18,396 = 18,396 : x
  2. Step 2: Convert to fraction form
    15,624/18,396 = 18,396/x
  3. Step 3: Cross multiply
    15,624x = 18,396 × 18,396
  4. Step 4: Simplify right side
    15,624x = 338,412,816
  5. Step 5: Solve for x
    x = 338,412,816/15,624
  6. Step 6: Final answer
    x = 21,659.81

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.