Home / 2,640.40-3,960.34-1,080.44

Finding the Fourth Proportional to 2,640.40, 3,960.34 and 1,080.44

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Solution

The fourth proportional to 2,640.40, 3,960.34 and 1,080.44 is: 1,620.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.40 : 3,960.34 = 1,080.44 : x
  2. Step 2: Convert to fraction form
    2,640.40/3,960.34 = 1,080.44/x
  3. Step 3: Cross multiply
    2,640.40x = 3,960.34 × 1,080.44
  4. Step 4: Simplify right side
    2,640.40x = 4,278,909.75
  5. Step 5: Solve for x
    x = 4,278,909.75/2,640.40
  6. Step 6: Final answer
    x = 1,620.55

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1.5x scale

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.