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Finding the Fourth Proportional to 257.72, 386.60 and 113.36

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Solution

The fourth proportional to 257.72, 386.60 and 113.36 is: 170.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.72 : 386.60 = 113.36 : x
  2. Step 2: Convert to fraction form
    257.72/386.60 = 113.36/x
  3. Step 3: Cross multiply
    257.72x = 386.60 × 113.36
  4. Step 4: Simplify right side
    257.72x = 43,822.48
  5. Step 5: Solve for x
    x = 43,822.48/257.72
  6. Step 6: Final answer
    x = 170.04

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