Home / 3,940.86-5,438.63-2,172.46

Finding the Fourth Proportional to 3,940.86, 5,438.63 and 2,172.46

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Solution

The fourth proportional to 3,940.86, 5,438.63 and 2,172.46 is: 2,998.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.86 : 5,438.63 = 2,172.46 : x
  2. Step 2: Convert to fraction form
    3,940.86/5,438.63 = 2,172.46/x
  3. Step 3: Cross multiply
    3,940.86x = 5,438.63 × 2,172.46
  4. Step 4: Simplify right side
    3,940.86x = 11,815,206.13
  5. Step 5: Solve for x
    x = 11,815,206.13/3,940.86
  6. Step 6: Final answer
    x = 2,998.13

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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.