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Finding the Fourth Proportional to 2,640.11, 3,960.60 and 996.80

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Solution

The fourth proportional to 2,640.11, 3,960.60 and 996.80 is: 1,495.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.11 : 3,960.60 = 996.80 : x
  2. Step 2: Convert to fraction form
    2,640.11/3,960.60 = 996.80/x
  3. Step 3: Cross multiply
    2,640.11x = 3,960.60 × 996.80
  4. Step 4: Simplify right side
    2,640.11x = 3,947,921.10
  5. Step 5: Solve for x
    x = 3,947,921.10/2,640.11
  6. Step 6: Final answer
    x = 1,495.36

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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.