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Finding the Fourth Proportional to 187.11, 258 and 124.80

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Solution

The fourth proportional to 187.11, 258 and 124.80 is: 172.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.11 : 258 = 124.80 : x
  2. Step 2: Convert to fraction form
    187.11/258 = 124.80/x
  3. Step 3: Cross multiply
    187.11x = 258 × 124.80
  4. Step 4: Simplify right side
    187.11x = 32,198.40
  5. Step 5: Solve for x
    x = 32,198.40/187.11
  6. Step 6: Final answer
    x = 172.08

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