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Finding the Fourth Proportional to 108.63, 149.94 and 71.91

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Solution

The fourth proportional to 108.63, 149.94 and 71.91 is: 99.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.63 : 149.94 = 71.91 : x
  2. Step 2: Convert to fraction form
    108.63/149.94 = 71.91/x
  3. Step 3: Cross multiply
    108.63x = 149.94 × 71.91
  4. Step 4: Simplify right side
    108.63x = 10,782.19
  5. Step 5: Solve for x
    x = 10,782.19/108.63
  6. Step 6: Final answer
    x = 99.26

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