Home / 3,940.89-5,438.43-2,172.66

Finding the Fourth Proportional to 3,940.89, 5,438.43 and 2,172.66

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Solution

The fourth proportional to 3,940.89, 5,438.43 and 2,172.66 is: 2,998.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.89 : 5,438.43 = 2,172.66 : x
  2. Step 2: Convert to fraction form
    3,940.89/5,438.43 = 2,172.66/x
  3. Step 3: Cross multiply
    3,940.89x = 5,438.43 × 2,172.66
  4. Step 4: Simplify right side
    3,940.89x = 11,815,859.32
  5. Step 5: Solve for x
    x = 11,815,859.32/3,940.89
  6. Step 6: Final answer
    x = 2,998.27

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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.