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Finding the Fourth Proportional to 103.92, 155.79 and 49.74

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Solution

The fourth proportional to 103.92, 155.79 and 49.74 is: 74.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.92 : 155.79 = 49.74 : x
  2. Step 2: Convert to fraction form
    103.92/155.79 = 49.74/x
  3. Step 3: Cross multiply
    103.92x = 155.79 × 49.74
  4. Step 4: Simplify right side
    103.92x = 7,748.99
  5. Step 5: Solve for x
    x = 7,748.99/103.92
  6. Step 6: Final answer
    x = 74.57

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