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Finding the Fourth Proportional to 130.88, 196.43 and 49.78

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Solution

The fourth proportional to 130.88, 196.43 and 49.78 is: 74.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.88 : 196.43 = 49.78 : x
  2. Step 2: Convert to fraction form
    130.88/196.43 = 49.78/x
  3. Step 3: Cross multiply
    130.88x = 196.43 × 49.78
  4. Step 4: Simplify right side
    130.88x = 9,778.29
  5. Step 5: Solve for x
    x = 9,778.29/130.88
  6. Step 6: Final answer
    x = 74.71

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