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Finding the Fourth Proportional to 317.81, 438.62 and 186.86

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Solution

The fourth proportional to 317.81, 438.62 and 186.86 is: 257.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.81 : 438.62 = 186.86 : x
  2. Step 2: Convert to fraction form
    317.81/438.62 = 186.86/x
  3. Step 3: Cross multiply
    317.81x = 438.62 × 186.86
  4. Step 4: Simplify right side
    317.81x = 81,957.41
  5. Step 5: Solve for x
    x = 81,957.41/317.81
  6. Step 6: Final answer
    x = 257.89

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