Home / 3,940.80-5,438.21-2,172.35

Finding the Fourth Proportional to 3,940.80, 5,438.21 and 2,172.35

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Solution

The fourth proportional to 3,940.80, 5,438.21 and 2,172.35 is: 2,997.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.80 : 5,438.21 = 2,172.35 : x
  2. Step 2: Convert to fraction form
    3,940.80/5,438.21 = 2,172.35/x
  3. Step 3: Cross multiply
    3,940.80x = 5,438.21 × 2,172.35
  4. Step 4: Simplify right side
    3,940.80x = 11,813,657.44
  5. Step 5: Solve for x
    x = 11,813,657.44/3,940.80
  6. Step 6: Final answer
    x = 2,997.78

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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.