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Finding the Fourth Proportional to 72,194.85, 99,631.01 and 39,930.43

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Solution

The fourth proportional to 72,194.85, 99,631.01 and 39,930.43 is: 55,105.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,194.85 : 99,631.01 = 39,930.43 : x
  2. Step 2: Convert to fraction form
    72,194.85/99,631.01 = 39,930.43/x
  3. Step 3: Cross multiply
    72,194.85x = 99,631.01 × 39,930.43
  4. Step 4: Simplify right side
    72,194.85x = 3,978,309,070.63
  5. Step 5: Solve for x
    x = 3,978,309,070.63/72,194.85
  6. Step 6: Final answer
    x = 55,105.16

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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.