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Finding the Fourth Proportional to 426.34, 639.59 and 137.75

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Solution

The fourth proportional to 426.34, 639.59 and 137.75 is: 206.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.34 : 639.59 = 137.75 : x
  2. Step 2: Convert to fraction form
    426.34/639.59 = 137.75/x
  3. Step 3: Cross multiply
    426.34x = 639.59 × 137.75
  4. Step 4: Simplify right side
    426.34x = 88,103.52
  5. Step 5: Solve for x
    x = 88,103.52/426.34
  6. Step 6: Final answer
    x = 206.65

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