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Finding the Fourth Proportional to 2,161.30, 3,242.34 and 863.68

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Solution

The fourth proportional to 2,161.30, 3,242.34 and 863.68 is: 1,295.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.30 : 3,242.34 = 863.68 : x
  2. Step 2: Convert to fraction form
    2,161.30/3,242.34 = 863.68/x
  3. Step 3: Cross multiply
    2,161.30x = 3,242.34 × 863.68
  4. Step 4: Simplify right side
    2,161.30x = 2,800,344.21
  5. Step 5: Solve for x
    x = 2,800,344.21/2,161.30
  6. Step 6: Final answer
    x = 1,295.68

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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.