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Finding the Fourth Proportional to 40.78, 61.09 and 39.56

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Solution

The fourth proportional to 40.78, 61.09 and 39.56 is: 59.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.78 : 61.09 = 39.56 : x
  2. Step 2: Convert to fraction form
    40.78/61.09 = 39.56/x
  3. Step 3: Cross multiply
    40.78x = 61.09 × 39.56
  4. Step 4: Simplify right side
    40.78x = 2,416.77
  5. Step 5: Solve for x
    x = 2,416.77/40.78
  6. Step 6: Final answer
    x = 59.27

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