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Finding the Fourth Proportional to 411.72, 617.78 and 290.76

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Solution

The fourth proportional to 411.72, 617.78 and 290.76 is: 436.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.72 : 617.78 = 290.76 : x
  2. Step 2: Convert to fraction form
    411.72/617.78 = 290.76/x
  3. Step 3: Cross multiply
    411.72x = 617.78 × 290.76
  4. Step 4: Simplify right side
    411.72x = 179,621.17
  5. Step 5: Solve for x
    x = 179,621.17/411.72
  6. Step 6: Final answer
    x = 436.28

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