Finding the Third Proportional to 191.25 and 272.81

Step by Step Solution

1. Step 1: Write the proportion equation
   191.25 : 272.81 = 272.81 : x
2. Step 2: Convert to fraction form
   191.25/272.81 = 272.81/x
3. Step 3: Cross multiply
   191.25x = 272.81 × 272.81
4. Step 4: Simplify right side
   191.25x = 74,426.66
5. Step 5: Solve for x
   x = 74,426.66/191.25
6. Step 6: Final answer
   x = 389.16