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Finding the Fourth Proportional to 84.23, 126.30 and 43.55

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Solution

The fourth proportional to 84.23, 126.30 and 43.55 is: 65.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.23 : 126.30 = 43.55 : x
  2. Step 2: Convert to fraction form
    84.23/126.30 = 43.55/x
  3. Step 3: Cross multiply
    84.23x = 126.30 × 43.55
  4. Step 4: Simplify right side
    84.23x = 5,500.84
  5. Step 5: Solve for x
    x = 5,500.84/84.23
  6. Step 6: Final answer
    x = 65.31

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