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Finding the Fourth Proportional to 257.55, 386.39 and 74.94

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Solution

The fourth proportional to 257.55, 386.39 and 74.94 is: 112.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.55 : 386.39 = 74.94 : x
  2. Step 2: Convert to fraction form
    257.55/386.39 = 74.94/x
  3. Step 3: Cross multiply
    257.55x = 386.39 × 74.94
  4. Step 4: Simplify right side
    257.55x = 28,955.69
  5. Step 5: Solve for x
    x = 28,955.69/257.55
  6. Step 6: Final answer
    x = 112.43

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