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Finding the Fourth Proportional to 287.06, 430.31 and 178.79

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Solution

The fourth proportional to 287.06, 430.31 and 178.79 is: 268.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.06 : 430.31 = 178.79 : x
  2. Step 2: Convert to fraction form
    287.06/430.31 = 178.79/x
  3. Step 3: Cross multiply
    287.06x = 430.31 × 178.79
  4. Step 4: Simplify right side
    287.06x = 76,932.08
  5. Step 5: Solve for x
    x = 76,932.08/287.06
  6. Step 6: Final answer
    x = 268.00

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