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Finding the Fourth Proportional to 388.24, 535.76 and 213.58

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Solution

The fourth proportional to 388.24, 535.76 and 213.58 is: 294.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.24 : 535.76 = 213.58 : x
  2. Step 2: Convert to fraction form
    388.24/535.76 = 213.58/x
  3. Step 3: Cross multiply
    388.24x = 535.76 × 213.58
  4. Step 4: Simplify right side
    388.24x = 114,427.62
  5. Step 5: Solve for x
    x = 114,427.62/388.24
  6. Step 6: Final answer
    x = 294.73

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