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Finding the Fourth Proportional to 72,464.58, 108,685.26 and 19,861.86

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Solution

The fourth proportional to 72,464.58, 108,685.26 and 19,861.86 is: 29,789.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,464.58 : 108,685.26 = 19,861.86 : x
  2. Step 2: Convert to fraction form
    72,464.58/108,685.26 = 19,861.86/x
  3. Step 3: Cross multiply
    72,464.58x = 108,685.26 × 19,861.86
  4. Step 4: Simplify right side
    72,464.58x = 2,158,691,418.18
  5. Step 5: Solve for x
    x = 2,158,691,418.18/72,464.58
  6. Step 6: Final answer
    x = 29,789.61

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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.