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Finding the Fourth Proportional to 2,399.92, 3,311.94 and 1,405.96

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Solution

The fourth proportional to 2,399.92, 3,311.94 and 1,405.96 is: 1,940.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,399.92 : 3,311.94 = 1,405.96 : x
  2. Step 2: Convert to fraction form
    2,399.92/3,311.94 = 1,405.96/x
  3. Step 3: Cross multiply
    2,399.92x = 3,311.94 × 1,405.96
  4. Step 4: Simplify right side
    2,399.92x = 4,656,455.16
  5. Step 5: Solve for x
    x = 4,656,455.16/2,399.92
  6. Step 6: Final answer
    x = 1,940.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.