Home / 3,940.86-5,438.16-2,172.12

Finding the Fourth Proportional to 3,940.86, 5,438.16 and 2,172.12

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Solution

The fourth proportional to 3,940.86, 5,438.16 and 2,172.12 is: 2,997.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.86 : 5,438.16 = 2,172.12 : x
  2. Step 2: Convert to fraction form
    3,940.86/5,438.16 = 2,172.12/x
  3. Step 3: Cross multiply
    3,940.86x = 5,438.16 × 2,172.12
  4. Step 4: Simplify right side
    3,940.86x = 11,812,336.10
  5. Step 5: Solve for x
    x = 11,812,336.10/3,940.86
  6. Step 6: Final answer
    x = 2,997.40

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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.