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Finding the Third Proportional to 1,821 and 3,858

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Solution

The third proportional to 1,821 and 3,858 is: 8,173.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821 : 3,858 = 3,858 : x
  2. Step 2: Convert to fraction form
    1,821/3,858 = 3,858/x
  3. Step 3: Cross multiply
    1,821x = 3,858 × 3,858
  4. Step 4: Simplify right side
    1,821x = 14,884,164
  5. Step 5: Solve for x
    x = 14,884,164/1,821
  6. Step 6: Final answer
    x = 8,173.62

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.