Home / 3,940.72-5,438.21-2,172.29

Finding the Fourth Proportional to 3,940.72, 5,438.21 and 2,172.29

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Solution

The fourth proportional to 3,940.72, 5,438.21 and 2,172.29 is: 2,997.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.72 : 5,438.21 = 2,172.29 : x
  2. Step 2: Convert to fraction form
    3,940.72/5,438.21 = 2,172.29/x
  3. Step 3: Cross multiply
    3,940.72x = 5,438.21 × 2,172.29
  4. Step 4: Simplify right side
    3,940.72x = 11,813,369.20
  5. Step 5: Solve for x
    x = 11,813,369.20/3,940.72
  6. Step 6: Final answer
    x = 2,997.77

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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.