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Finding the Fourth Proportional to 412.74, 619.16 and 138.87

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Solution

The fourth proportional to 412.74, 619.16 and 138.87 is: 208.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.74 : 619.16 = 138.87 : x
  2. Step 2: Convert to fraction form
    412.74/619.16 = 138.87/x
  3. Step 3: Cross multiply
    412.74x = 619.16 × 138.87
  4. Step 4: Simplify right side
    412.74x = 85,982.05
  5. Step 5: Solve for x
    x = 85,982.05/412.74
  6. Step 6: Final answer
    x = 208.32

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