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Finding the Fourth Proportional to 72,003.68, 99,365.13 and 40,172.58

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Solution

The fourth proportional to 72,003.68, 99,365.13 and 40,172.58 is: 55,438.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,003.68 : 99,365.13 = 40,172.58 : x
  2. Step 2: Convert to fraction form
    72,003.68/99,365.13 = 40,172.58/x
  3. Step 3: Cross multiply
    72,003.68x = 99,365.13 × 40,172.58
  4. Step 4: Simplify right side
    72,003.68x = 3,991,753,634.14
  5. Step 5: Solve for x
    x = 3,991,753,634.14/72,003.68
  6. Step 6: Final answer
    x = 55,438.19

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