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Finding the Fourth Proportional to 218.94, 328.42 and 56.64

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Solution

The fourth proportional to 218.94, 328.42 and 56.64 is: 84.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.94 : 328.42 = 56.64 : x
  2. Step 2: Convert to fraction form
    218.94/328.42 = 56.64/x
  3. Step 3: Cross multiply
    218.94x = 328.42 × 56.64
  4. Step 4: Simplify right side
    218.94x = 18,601.71
  5. Step 5: Solve for x
    x = 18,601.71/218.94
  6. Step 6: Final answer
    x = 84.96

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