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Finding the Fourth Proportional to 3,821, 5,273.22 and 2,165

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Solution

The fourth proportional to 3,821, 5,273.22 and 2,165 is: 2,987.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,821 : 5,273.22 = 2,165 : x
  2. Step 2: Convert to fraction form
    3,821/5,273.22 = 2,165/x
  3. Step 3: Cross multiply
    3,821x = 5,273.22 × 2,165
  4. Step 4: Simplify right side
    3,821x = 11,416,521.30
  5. Step 5: Solve for x
    x = 11,416,521.30/3,821
  6. Step 6: Final answer
    x = 2,987.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.