Home / 3,940.99-5,438.37-2,172.31

Finding the Fourth Proportional to 3,940.99, 5,438.37 and 2,172.31

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Solution

The fourth proportional to 3,940.99, 5,438.37 and 2,172.31 is: 2,997.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.99 : 5,438.37 = 2,172.31 : x
  2. Step 2: Convert to fraction form
    3,940.99/5,438.37 = 2,172.31/x
  3. Step 3: Cross multiply
    3,940.99x = 5,438.37 × 2,172.31
  4. Step 4: Simplify right side
    3,940.99x = 11,813,825.53
  5. Step 5: Solve for x
    x = 11,813,825.53/3,940.99
  6. Step 6: Final answer
    x = 2,997.68

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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.