Home / 3,940.55-5,437.80-2,172.15

Finding the Fourth Proportional to 3,940.55, 5,437.80 and 2,172.15

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Solution

The fourth proportional to 3,940.55, 5,437.80 and 2,172.15 is: 2,997.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.55 : 5,437.80 = 2,172.15 : x
  2. Step 2: Convert to fraction form
    3,940.55/5,437.80 = 2,172.15/x
  3. Step 3: Cross multiply
    3,940.55x = 5,437.80 × 2,172.15
  4. Step 4: Simplify right side
    3,940.55x = 11,811,717.27
  5. Step 5: Solve for x
    x = 11,811,717.27/3,940.55
  6. Step 6: Final answer
    x = 2,997.48

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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.