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Finding the Fourth Proportional to 428.26, 641.43 and 265.60

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Solution

The fourth proportional to 428.26, 641.43 and 265.60 is: 397.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.26 : 641.43 = 265.60 : x
  2. Step 2: Convert to fraction form
    428.26/641.43 = 265.60/x
  3. Step 3: Cross multiply
    428.26x = 641.43 × 265.60
  4. Step 4: Simplify right side
    428.26x = 170,363.81
  5. Step 5: Solve for x
    x = 170,363.81/428.26
  6. Step 6: Final answer
    x = 397.80

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