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Finding the Fourth Proportional to 115.03, 172.18 and 74.31

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Solution

The fourth proportional to 115.03, 172.18 and 74.31 is: 111.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.03 : 172.18 = 74.31 : x
  2. Step 2: Convert to fraction form
    115.03/172.18 = 74.31/x
  3. Step 3: Cross multiply
    115.03x = 172.18 × 74.31
  4. Step 4: Simplify right side
    115.03x = 12,794.70
  5. Step 5: Solve for x
    x = 12,794.70/115.03
  6. Step 6: Final answer
    x = 111.23

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