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Finding the Fourth Proportional to 427.37, 641.03 and 138.78

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Solution

The fourth proportional to 427.37, 641.03 and 138.78 is: 208.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.37 : 641.03 = 138.78 : x
  2. Step 2: Convert to fraction form
    427.37/641.03 = 138.78/x
  3. Step 3: Cross multiply
    427.37x = 641.03 × 138.78
  4. Step 4: Simplify right side
    427.37x = 88,961.45
  5. Step 5: Solve for x
    x = 88,961.45/427.37
  6. Step 6: Final answer
    x = 208.16

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