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Finding the Fourth Proportional to 283.76, 391.86 and 221.36

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Solution

The fourth proportional to 283.76, 391.86 and 221.36 is: 305.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.76 : 391.86 = 221.36 : x
  2. Step 2: Convert to fraction form
    283.76/391.86 = 221.36/x
  3. Step 3: Cross multiply
    283.76x = 391.86 × 221.36
  4. Step 4: Simplify right side
    283.76x = 86,742.13
  5. Step 5: Solve for x
    x = 86,742.13/283.76
  6. Step 6: Final answer
    x = 305.69

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