Home / 3,940.35-5,437.76-2,172.05

Finding the Fourth Proportional to 3,940.35, 5,437.76 and 2,172.05

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Solution

The fourth proportional to 3,940.35, 5,437.76 and 2,172.05 is: 2,997.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.35 : 5,437.76 = 2,172.05 : x
  2. Step 2: Convert to fraction form
    3,940.35/5,437.76 = 2,172.05/x
  3. Step 3: Cross multiply
    3,940.35x = 5,437.76 × 2,172.05
  4. Step 4: Simplify right side
    3,940.35x = 11,811,086.61
  5. Step 5: Solve for x
    x = 11,811,086.61/3,940.35
  6. Step 6: Final answer
    x = 2,997.47

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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.