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Finding the Fourth Proportional to 72,699.21, 100,314.05 and 40,861.96

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Solution

The fourth proportional to 72,699.21, 100,314.05 and 40,861.96 is: 56,383.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,699.21 : 100,314.05 = 40,861.96 : x
  2. Step 2: Convert to fraction form
    72,699.21/100,314.05 = 40,861.96/x
  3. Step 3: Cross multiply
    72,699.21x = 100,314.05 × 40,861.96
  4. Step 4: Simplify right side
    72,699.21x = 4,099,028,243.44
  5. Step 5: Solve for x
    x = 4,099,028,243.44/72,699.21
  6. Step 6: Final answer
    x = 56,383.39

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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.