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Finding the Fourth Proportional to 112.94, 169.35 and 76.88

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Solution

The fourth proportional to 112.94, 169.35 and 76.88 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.94 : 169.35 = 76.88 : x
  2. Step 2: Convert to fraction form
    112.94/169.35 = 76.88/x
  3. Step 3: Cross multiply
    112.94x = 169.35 × 76.88
  4. Step 4: Simplify right side
    112.94x = 13,019.63
  5. Step 5: Solve for x
    x = 13,019.63/112.94
  6. Step 6: Final answer
    x = 115.28

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