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Finding the Fourth Proportional to 13,908.68, 20,863.11 and 3,520.46

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Solution

The fourth proportional to 13,908.68, 20,863.11 and 3,520.46 is: 5,280.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,908.68 : 20,863.11 = 3,520.46 : x
  2. Step 2: Convert to fraction form
    13,908.68/20,863.11 = 3,520.46/x
  3. Step 3: Cross multiply
    13,908.68x = 20,863.11 × 3,520.46
  4. Step 4: Simplify right side
    13,908.68x = 73,447,744.23
  5. Step 5: Solve for x
    x = 73,447,744.23/13,908.68
  6. Step 6: Final answer
    x = 5,280.71

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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.