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Finding the Fourth Proportional to 103.76, 155.62 and 31.62

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Solution

The fourth proportional to 103.76, 155.62 and 31.62 is: 47.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.76 : 155.62 = 31.62 : x
  2. Step 2: Convert to fraction form
    103.76/155.62 = 31.62/x
  3. Step 3: Cross multiply
    103.76x = 155.62 × 31.62
  4. Step 4: Simplify right side
    103.76x = 4,920.70
  5. Step 5: Solve for x
    x = 4,920.70/103.76
  6. Step 6: Final answer
    x = 47.42

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