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Finding the Fourth Proportional to 13,612.68, 18,787.53 and 8,310.57

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Solution

The fourth proportional to 13,612.68, 18,787.53 and 8,310.57 is: 11,469.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,612.68 : 18,787.53 = 8,310.57 : x
  2. Step 2: Convert to fraction form
    13,612.68/18,787.53 = 8,310.57/x
  3. Step 3: Cross multiply
    13,612.68x = 18,787.53 × 8,310.57
  4. Step 4: Simplify right side
    13,612.68x = 156,135,083.19
  5. Step 5: Solve for x
    x = 156,135,083.19/13,612.68
  6. Step 6: Final answer
    x = 11,469.83

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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.