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Finding the Fourth Proportional to 72,691.43, 100,322.15 and 40,859.64

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Solution

The fourth proportional to 72,691.43, 100,322.15 and 40,859.64 is: 56,390.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,691.43 : 100,322.15 = 40,859.64 : x
  2. Step 2: Convert to fraction form
    72,691.43/100,322.15 = 40,859.64/x
  3. Step 3: Cross multiply
    72,691.43x = 100,322.15 × 40,859.64
  4. Step 4: Simplify right side
    72,691.43x = 4,099,126,728.73
  5. Step 5: Solve for x
    x = 4,099,126,728.73/72,691.43
  6. Step 6: Final answer
    x = 56,390.79

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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.