Home / 3,711.45-5,120.20-2,138.61

Finding the Fourth Proportional to 3,711.45, 5,120.20 and 2,138.61

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Solution

The fourth proportional to 3,711.45, 5,120.20 and 2,138.61 is: 2,950.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,711.45 : 5,120.20 = 2,138.61 : x
  2. Step 2: Convert to fraction form
    3,711.45/5,120.20 = 2,138.61/x
  3. Step 3: Cross multiply
    3,711.45x = 5,120.20 × 2,138.61
  4. Step 4: Simplify right side
    3,711.45x = 10,950,110.92
  5. Step 5: Solve for x
    x = 10,950,110.92/3,711.45
  6. Step 6: Final answer
    x = 2,950.36

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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.