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Finding the Fourth Proportional to 115.25, 172.90 and 54.35

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Solution

The fourth proportional to 115.25, 172.90 and 54.35 is: 81.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.25 : 172.90 = 54.35 : x
  2. Step 2: Convert to fraction form
    115.25/172.90 = 54.35/x
  3. Step 3: Cross multiply
    115.25x = 172.90 × 54.35
  4. Step 4: Simplify right side
    115.25x = 9,395.98
  5. Step 5: Solve for x
    x = 9,395.98/115.25
  6. Step 6: Final answer
    x = 81.53

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