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Finding the Fourth Proportional to 72,619.92, 100,255.86 and 55,591.56

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Solution

The fourth proportional to 72,619.92, 100,255.86 and 55,591.56 is: 76,747.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,619.92 : 100,255.86 = 55,591.56 : x
  2. Step 2: Convert to fraction form
    72,619.92/100,255.86 = 55,591.56/x
  3. Step 3: Cross multiply
    72,619.92x = 100,255.86 × 55,591.56
  4. Step 4: Simplify right side
    72,619.92x = 5,573,379,656.54
  5. Step 5: Solve for x
    x = 5,573,379,656.54/72,619.92
  6. Step 6: Final answer
    x = 76,747.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.