Home / 3,940.85-5,438.39-2,172.58

Finding the Fourth Proportional to 3,940.85, 5,438.39 and 2,172.58

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Solution

The fourth proportional to 3,940.85, 5,438.39 and 2,172.58 is: 2,998.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.85 : 5,438.39 = 2,172.58 : x
  2. Step 2: Convert to fraction form
    3,940.85/5,438.39 = 2,172.58/x
  3. Step 3: Cross multiply
    3,940.85x = 5,438.39 × 2,172.58
  4. Step 4: Simplify right side
    3,940.85x = 11,815,337.35
  5. Step 5: Solve for x
    x = 11,815,337.35/3,940.85
  6. Step 6: Final answer
    x = 2,998.17

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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.