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Finding the Fourth Proportional to 144.82, 216.90 and 72.70

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Solution

The fourth proportional to 144.82, 216.90 and 72.70 is: 108.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.82 : 216.90 = 72.70 : x
  2. Step 2: Convert to fraction form
    144.82/216.90 = 72.70/x
  3. Step 3: Cross multiply
    144.82x = 216.90 × 72.70
  4. Step 4: Simplify right side
    144.82x = 15,768.63
  5. Step 5: Solve for x
    x = 15,768.63/144.82
  6. Step 6: Final answer
    x = 108.88

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