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Finding the Fourth Proportional to 408.56, 613.68 and 355.04

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Solution

The fourth proportional to 408.56, 613.68 and 355.04 is: 533.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.56 : 613.68 = 355.04 : x
  2. Step 2: Convert to fraction form
    408.56/613.68 = 355.04/x
  3. Step 3: Cross multiply
    408.56x = 613.68 × 355.04
  4. Step 4: Simplify right side
    408.56x = 217,880.95
  5. Step 5: Solve for x
    x = 217,880.95/408.56
  6. Step 6: Final answer
    x = 533.29

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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.