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Finding the Fourth Proportional to 427.82, 641.74 and 139.26

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Solution

The fourth proportional to 427.82, 641.74 and 139.26 is: 208.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.82 : 641.74 = 139.26 : x
  2. Step 2: Convert to fraction form
    427.82/641.74 = 139.26/x
  3. Step 3: Cross multiply
    427.82x = 641.74 × 139.26
  4. Step 4: Simplify right side
    427.82x = 89,368.71
  5. Step 5: Solve for x
    x = 89,368.71/427.82
  6. Step 6: Final answer
    x = 208.89

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