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Finding the Fourth Proportional to 827.75, 1,240.80 and 341.21

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Solution

The fourth proportional to 827.75, 1,240.80 and 341.21 is: 511.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.75 : 1,240.80 = 341.21 : x
  2. Step 2: Convert to fraction form
    827.75/1,240.80 = 341.21/x
  3. Step 3: Cross multiply
    827.75x = 1,240.80 × 341.21
  4. Step 4: Simplify right side
    827.75x = 423,367.16
  5. Step 5: Solve for x
    x = 423,367.16/827.75
  6. Step 6: Final answer
    x = 511.47

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