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Finding the Fourth Proportional to 218.94, 328.41 and 72.70

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Solution

The fourth proportional to 218.94, 328.41 and 72.70 is: 109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.94 : 328.41 = 72.70 : x
  2. Step 2: Convert to fraction form
    218.94/328.41 = 72.70/x
  3. Step 3: Cross multiply
    218.94x = 328.41 × 72.70
  4. Step 4: Simplify right side
    218.94x = 23,875.41
  5. Step 5: Solve for x
    x = 23,875.41/218.94
  6. Step 6: Final answer
    x = 109.05

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