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Finding the Fourth Proportional to 3,891.17, 5,836.71 and 1,117.87

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Solution

The fourth proportional to 3,891.17, 5,836.71 and 1,117.87 is: 1,676.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.17 : 5,836.71 = 1,117.87 : x
  2. Step 2: Convert to fraction form
    3,891.17/5,836.71 = 1,117.87/x
  3. Step 3: Cross multiply
    3,891.17x = 5,836.71 × 1,117.87
  4. Step 4: Simplify right side
    3,891.17x = 6,524,672.61
  5. Step 5: Solve for x
    x = 6,524,672.61/3,891.17
  6. Step 6: Final answer
    x = 1,676.79

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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.