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Finding the Fourth Proportional to 100,690.24, 138,949.71 and 55,368.31

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Solution

The fourth proportional to 100,690.24, 138,949.71 and 55,368.31 is: 76,406.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,690.24 : 138,949.71 = 55,368.31 : x
  2. Step 2: Convert to fraction form
    100,690.24/138,949.71 = 55,368.31/x
  3. Step 3: Cross multiply
    100,690.24x = 138,949.71 × 55,368.31
  4. Step 4: Simplify right side
    100,690.24x = 7,693,410,617.69
  5. Step 5: Solve for x
    x = 7,693,410,617.69/100,690.24
  6. Step 6: Final answer
    x = 76,406.72

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