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Finding the Fourth Proportional to 2,639.94, 3,960.78 and 996.63

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Solution

The fourth proportional to 2,639.94, 3,960.78 and 996.63 is: 1,495.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.94 : 3,960.78 = 996.63 : x
  2. Step 2: Convert to fraction form
    2,639.94/3,960.78 = 996.63/x
  3. Step 3: Cross multiply
    2,639.94x = 3,960.78 × 996.63
  4. Step 4: Simplify right side
    2,639.94x = 3,947,419.19
  5. Step 5: Solve for x
    x = 3,947,419.19/2,639.94
  6. Step 6: Final answer
    x = 1,495.27

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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.