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Finding the Fourth Proportional to 148.08, 221.96 and 66.90

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Solution

The fourth proportional to 148.08, 221.96 and 66.90 is: 100.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.08 : 221.96 = 66.90 : x
  2. Step 2: Convert to fraction form
    148.08/221.96 = 66.90/x
  3. Step 3: Cross multiply
    148.08x = 221.96 × 66.90
  4. Step 4: Simplify right side
    148.08x = 14,849.12
  5. Step 5: Solve for x
    x = 14,849.12/148.08
  6. Step 6: Final answer
    x = 100.28

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