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Finding the Fourth Proportional to 2,161.80, 3,240.81 and 862.38

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Solution

The fourth proportional to 2,161.80, 3,240.81 and 862.38 is: 1,292.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.80 : 3,240.81 = 862.38 : x
  2. Step 2: Convert to fraction form
    2,161.80/3,240.81 = 862.38/x
  3. Step 3: Cross multiply
    2,161.80x = 3,240.81 × 862.38
  4. Step 4: Simplify right side
    2,161.80x = 2,794,809.73
  5. Step 5: Solve for x
    x = 2,794,809.73/2,161.80
  6. Step 6: Final answer
    x = 1,292.82

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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.