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Finding the Fourth Proportional to 66,879.27, 100,333.89 and 20,135.79

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Solution

The fourth proportional to 66,879.27, 100,333.89 and 20,135.79 is: 30,208.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,879.27 : 100,333.89 = 20,135.79 : x
  2. Step 2: Convert to fraction form
    66,879.27/100,333.89 = 20,135.79/x
  3. Step 3: Cross multiply
    66,879.27x = 100,333.89 × 20,135.79
  4. Step 4: Simplify right side
    66,879.27x = 2,020,302,138.92
  5. Step 5: Solve for x
    x = 2,020,302,138.92/66,879.27
  6. Step 6: Final answer
    x = 30,208.20

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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.