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Finding the Fourth Proportional to 103.05, 154.65 and 77.08

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Solution

The fourth proportional to 103.05, 154.65 and 77.08 is: 115.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.05 : 154.65 = 77.08 : x
  2. Step 2: Convert to fraction form
    103.05/154.65 = 77.08/x
  3. Step 3: Cross multiply
    103.05x = 154.65 × 77.08
  4. Step 4: Simplify right side
    103.05x = 11,920.42
  5. Step 5: Solve for x
    x = 11,920.42/103.05
  6. Step 6: Final answer
    x = 115.68

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