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Finding the Fourth Proportional to 408.05, 612.74 and 225.80

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Solution

The fourth proportional to 408.05, 612.74 and 225.80 is: 339.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.05 : 612.74 = 225.80 : x
  2. Step 2: Convert to fraction form
    408.05/612.74 = 225.80/x
  3. Step 3: Cross multiply
    408.05x = 612.74 × 225.80
  4. Step 4: Simplify right side
    408.05x = 138,354.19
  5. Step 5: Solve for x
    x = 138,354.19/408.05
  6. Step 6: Final answer
    x = 339.07

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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.