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Finding the Fourth Proportional to 13,891.42, 20,836.39 and 3,896.86

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Solution

The fourth proportional to 13,891.42, 20,836.39 and 3,896.86 is: 5,845.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,891.42 : 20,836.39 = 3,896.86 : x
  2. Step 2: Convert to fraction form
    13,891.42/20,836.39 = 3,896.86/x
  3. Step 3: Cross multiply
    13,891.42x = 20,836.39 × 3,896.86
  4. Step 4: Simplify right side
    13,891.42x = 81,196,425.68
  5. Step 5: Solve for x
    x = 81,196,425.68/13,891.42
  6. Step 6: Final answer
    x = 5,845.08

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1.5x scale

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.