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Finding the Fourth Proportional to 20,599.99, 30,879.16 and 8,115.17

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Solution

The fourth proportional to 20,599.99, 30,879.16 and 8,115.17 is: 12,164.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,599.99 : 30,879.16 = 8,115.17 : x
  2. Step 2: Convert to fraction form
    20,599.99/30,879.16 = 8,115.17/x
  3. Step 3: Cross multiply
    20,599.99x = 30,879.16 × 8,115.17
  4. Step 4: Simplify right side
    20,599.99x = 250,589,458.17
  5. Step 5: Solve for x
    x = 250,589,458.17/20,599.99
  6. Step 6: Final answer
    x = 12,164.54

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Similar ratio
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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.