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Finding the Fourth Proportional to 627.36, 940.81 and 408.21

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Solution

The fourth proportional to 627.36, 940.81 and 408.21 is: 612.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.36 : 940.81 = 408.21 : x
  2. Step 2: Convert to fraction form
    627.36/940.81 = 408.21/x
  3. Step 3: Cross multiply
    627.36x = 940.81 × 408.21
  4. Step 4: Simplify right side
    627.36x = 384,048.05
  5. Step 5: Solve for x
    x = 384,048.05/627.36
  6. Step 6: Final answer
    x = 612.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.