Home / 3,940.90-5,438.45-2,172.47

Finding the Fourth Proportional to 3,940.90, 5,438.45 and 2,172.47

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Solution

The fourth proportional to 3,940.90, 5,438.45 and 2,172.47 is: 2,998.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.90 : 5,438.45 = 2,172.47 : x
  2. Step 2: Convert to fraction form
    3,940.90/5,438.45 = 2,172.47/x
  3. Step 3: Cross multiply
    3,940.90x = 5,438.45 × 2,172.47
  4. Step 4: Simplify right side
    3,940.90x = 11,814,842.28
  5. Step 5: Solve for x
    x = 11,814,842.28/3,940.90
  6. Step 6: Final answer
    x = 2,998.01

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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.