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Finding the Fourth Proportional to 103.82, 155.77 and 39.70

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Solution

The fourth proportional to 103.82, 155.77 and 39.70 is: 59.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.82 : 155.77 = 39.70 : x
  2. Step 2: Convert to fraction form
    103.82/155.77 = 39.70/x
  3. Step 3: Cross multiply
    103.82x = 155.77 × 39.70
  4. Step 4: Simplify right side
    103.82x = 6,184.07
  5. Step 5: Solve for x
    x = 6,184.07/103.82
  6. Step 6: Final answer
    x = 59.57

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