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Finding the Fourth Proportional to 18,619.10, 27,912.92 and 8,081.15

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Solution

The fourth proportional to 18,619.10, 27,912.92 and 8,081.15 is: 12,114.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,619.10 : 27,912.92 = 8,081.15 : x
  2. Step 2: Convert to fraction form
    18,619.10/27,912.92 = 8,081.15/x
  3. Step 3: Cross multiply
    18,619.10x = 27,912.92 × 8,081.15
  4. Step 4: Simplify right side
    18,619.10x = 225,568,470.50
  5. Step 5: Solve for x
    x = 225,568,470.50/18,619.10
  6. Step 6: Final answer
    x = 12,114.90

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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.