Home / 3,940.83-5,438.28-2,172.41

Finding the Fourth Proportional to 3,940.83, 5,438.28 and 2,172.41

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Solution

The fourth proportional to 3,940.83, 5,438.28 and 2,172.41 is: 2,997.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.83 : 5,438.28 = 2,172.41 : x
  2. Step 2: Convert to fraction form
    3,940.83/5,438.28 = 2,172.41/x
  3. Step 3: Cross multiply
    3,940.83x = 5,438.28 × 2,172.41
  4. Step 4: Simplify right side
    3,940.83x = 11,814,146.66
  5. Step 5: Solve for x
    x = 11,814,146.66/3,940.83
  6. Step 6: Final answer
    x = 2,997.88

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1.5x scale

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.