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Finding the Fourth Proportional to 13,286.08, 18,330 and 8,812

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Solution

The fourth proportional to 13,286.08, 18,330 and 8,812 is: 12,157.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,286.08 : 18,330 = 8,812 : x
  2. Step 2: Convert to fraction form
    13,286.08/18,330 = 8,812/x
  3. Step 3: Cross multiply
    13,286.08x = 18,330 × 8,812
  4. Step 4: Simplify right side
    13,286.08x = 161,523,960
  5. Step 5: Solve for x
    x = 161,523,960/13,286.08
  6. Step 6: Final answer
    x = 12,157.38

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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.