Home / 3,891.31-5,369.96-2,122.88

Finding the Fourth Proportional to 3,891.31, 5,369.96 and 2,122.88

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Solution

The fourth proportional to 3,891.31, 5,369.96 and 2,122.88 is: 2,929.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.31 : 5,369.96 = 2,122.88 : x
  2. Step 2: Convert to fraction form
    3,891.31/5,369.96 = 2,122.88/x
  3. Step 3: Cross multiply
    3,891.31x = 5,369.96 × 2,122.88
  4. Step 4: Simplify right side
    3,891.31x = 11,399,759.14
  5. Step 5: Solve for x
    x = 11,399,759.14/3,891.31
  6. Step 6: Final answer
    x = 2,929.54

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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.