Home / 3,900.40-5,382.54-2,131.96

Finding the Fourth Proportional to 3,900.40, 5,382.54 and 2,131.96

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Solution

The fourth proportional to 3,900.40, 5,382.54 and 2,131.96 is: 2,942.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.40 : 5,382.54 = 2,131.96 : x
  2. Step 2: Convert to fraction form
    3,900.40/5,382.54 = 2,131.96/x
  3. Step 3: Cross multiply
    3,900.40x = 5,382.54 × 2,131.96
  4. Step 4: Simplify right side
    3,900.40x = 11,475,359.98
  5. Step 5: Solve for x
    x = 11,475,359.98/3,900.40
  6. Step 6: Final answer
    x = 2,942.10

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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.