Home / 3,981.20-5,974.20-1,385.96

Finding the Fourth Proportional to 3,981.20, 5,974.20 and 1,385.96

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Solution

The fourth proportional to 3,981.20, 5,974.20 and 1,385.96 is: 2,079.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,981.20 : 5,974.20 = 1,385.96 : x
  2. Step 2: Convert to fraction form
    3,981.20/5,974.20 = 1,385.96/x
  3. Step 3: Cross multiply
    3,981.20x = 5,974.20 × 1,385.96
  4. Step 4: Simplify right side
    3,981.20x = 8,280,022.36
  5. Step 5: Solve for x
    x = 8,280,022.36/3,981.20
  6. Step 6: Final answer
    x = 2,079.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.