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Finding the Fourth Proportional to 100,715.52, 138,990.81 and 55,397.00

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Solution

The fourth proportional to 100,715.52, 138,990.81 and 55,397.00 is: 76,449.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,715.52 : 138,990.81 = 55,397.00 : x
  2. Step 2: Convert to fraction form
    100,715.52/138,990.81 = 55,397.00/x
  3. Step 3: Cross multiply
    100,715.52x = 138,990.81 × 55,397.00
  4. Step 4: Simplify right side
    100,715.52x = 7,699,674,249.05
  5. Step 5: Solve for x
    x = 7,699,674,249.05/100,715.52
  6. Step 6: Final answer
    x = 76,449.73

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