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Finding the Fourth Proportional to 3,891.88, 5,369.79 and 2,318.86

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Solution

The fourth proportional to 3,891.88, 5,369.79 and 2,318.86 is: 3,199.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.88 : 5,369.79 = 2,318.86 : x
  2. Step 2: Convert to fraction form
    3,891.88/5,369.79 = 2,318.86/x
  3. Step 3: Cross multiply
    3,891.88x = 5,369.79 × 2,318.86
  4. Step 4: Simplify right side
    3,891.88x = 12,451,791.24
  5. Step 5: Solve for x
    x = 12,451,791.24/3,891.88
  6. Step 6: Final answer
    x = 3,199.43

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1.5x scale

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.