Home / 2,120.90-3,178.92-1,144.96

Finding the Fourth Proportional to 2,120.90, 3,178.92 and 1,144.96

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Solution

The fourth proportional to 2,120.90, 3,178.92 and 1,144.96 is: 1,716.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.90 : 3,178.92 = 1,144.96 : x
  2. Step 2: Convert to fraction form
    2,120.90/3,178.92 = 1,144.96/x
  3. Step 3: Cross multiply
    2,120.90x = 3,178.92 × 1,144.96
  4. Step 4: Simplify right side
    2,120.90x = 3,639,720.35
  5. Step 5: Solve for x
    x = 3,639,720.35/2,120.90
  6. Step 6: Final answer
    x = 1,716.12

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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.