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Finding the Fourth Proportional to 415.28, 622.68 and 171.60

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Solution

The fourth proportional to 415.28, 622.68 and 171.60 is: 257.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.28 : 622.68 = 171.60 : x
  2. Step 2: Convert to fraction form
    415.28/622.68 = 171.60/x
  3. Step 3: Cross multiply
    415.28x = 622.68 × 171.60
  4. Step 4: Simplify right side
    415.28x = 106,851.89
  5. Step 5: Solve for x
    x = 106,851.89/415.28
  6. Step 6: Final answer
    x = 257.30

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