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Finding the Fourth Proportional to 13,906.87, 20,736.25 and 12,361.39

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Solution

The fourth proportional to 13,906.87, 20,736.25 and 12,361.39 is: 18,431.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,906.87 : 20,736.25 = 12,361.39 : x
  2. Step 2: Convert to fraction form
    13,906.87/20,736.25 = 12,361.39/x
  3. Step 3: Cross multiply
    13,906.87x = 20,736.25 × 12,361.39
  4. Step 4: Simplify right side
    13,906.87x = 256,328,873.39
  5. Step 5: Solve for x
    x = 256,328,873.39/13,906.87
  6. Step 6: Final answer
    x = 18,431.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.