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Finding the Fourth Proportional to 917.76, 1,376.79 and 268.56

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Solution

The fourth proportional to 917.76, 1,376.79 and 268.56 is: 402.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.76 : 1,376.79 = 268.56 : x
  2. Step 2: Convert to fraction form
    917.76/1,376.79 = 268.56/x
  3. Step 3: Cross multiply
    917.76x = 1,376.79 × 268.56
  4. Step 4: Simplify right side
    917.76x = 369,750.72
  5. Step 5: Solve for x
    x = 369,750.72/917.76
  6. Step 6: Final answer
    x = 402.88

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