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Finding the Fourth Proportional to 72,679.56, 100,272.90 and 47,217.96

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Solution

The fourth proportional to 72,679.56, 100,272.90 and 47,217.96 is: 65,144.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,679.56 : 100,272.90 = 47,217.96 : x
  2. Step 2: Convert to fraction form
    72,679.56/100,272.90 = 47,217.96/x
  3. Step 3: Cross multiply
    72,679.56x = 100,272.90 × 47,217.96
  4. Step 4: Simplify right side
    72,679.56x = 4,734,681,781.28
  5. Step 5: Solve for x
    x = 4,734,681,781.28/72,679.56
  6. Step 6: Final answer
    x = 65,144.61

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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.