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Finding the Third Proportional to 37,821 and 81,420

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Solution

The third proportional to 37,821 and 81,420 is: 175,278.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    37,821 : 81,420 = 81,420 : x
  2. Step 2: Convert to fraction form
    37,821/81,420 = 81,420/x
  3. Step 3: Cross multiply
    37,821x = 81,420 × 81,420
  4. Step 4: Simplify right side
    37,821x = 6,629,216,400
  5. Step 5: Solve for x
    x = 6,629,216,400/37,821
  6. Step 6: Final answer
    x = 175,278.72

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.