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Finding the Fourth Proportional to 72,879.75, 109,319.64 and 20,290.62

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Solution

The fourth proportional to 72,879.75, 109,319.64 and 20,290.62 is: 30,435.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,879.75 : 109,319.64 = 20,290.62 : x
  2. Step 2: Convert to fraction form
    72,879.75/109,319.64 = 20,290.62/x
  3. Step 3: Cross multiply
    72,879.75x = 109,319.64 × 20,290.62
  4. Step 4: Simplify right side
    72,879.75x = 2,218,163,273.78
  5. Step 5: Solve for x
    x = 2,218,163,273.78/72,879.75
  6. Step 6: Final answer
    x = 30,435.93

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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.