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Finding the Fourth Proportional to 2,639.85, 3,960.34 and 996.36

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Solution

The fourth proportional to 2,639.85, 3,960.34 and 996.36 is: 1,494.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.85 : 3,960.34 = 996.36 : x
  2. Step 2: Convert to fraction form
    2,639.85/3,960.34 = 996.36/x
  3. Step 3: Cross multiply
    2,639.85x = 3,960.34 × 996.36
  4. Step 4: Simplify right side
    2,639.85x = 3,945,924.36
  5. Step 5: Solve for x
    x = 3,945,924.36/2,639.85
  6. Step 6: Final answer
    x = 1,494.75

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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.