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Finding the Third Proportional to 1,821.85 and 3,990.30

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Solution

The third proportional to 1,821.85 and 3,990.30 is: 8,739.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.85 : 3,990.30 = 3,990.30 : x
  2. Step 2: Convert to fraction form
    1,821.85/3,990.30 = 3,990.30/x
  3. Step 3: Cross multiply
    1,821.85x = 3,990.30 × 3,990.30
  4. Step 4: Simplify right side
    1,821.85x = 15,922,498.62
  5. Step 5: Solve for x
    x = 15,922,498.62/1,821.85
  6. Step 6: Final answer
    x = 8,739.72

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.