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Finding the Fourth Proportional to 2,191.86, 3,286.95 and 1,191

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Solution

The fourth proportional to 2,191.86, 3,286.95 and 1,191 is: 1,786.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,191.86 : 3,286.95 = 1,191 : x
  2. Step 2: Convert to fraction form
    2,191.86/3,286.95 = 1,191/x
  3. Step 3: Cross multiply
    2,191.86x = 3,286.95 × 1,191
  4. Step 4: Simplify right side
    2,191.86x = 3,914,757.45
  5. Step 5: Solve for x
    x = 3,914,757.45/2,191.86
  6. Step 6: Final answer
    x = 1,786.04

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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.