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Finding the Fourth Proportional to 511.22, 765.20 and 408.62

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Solution

The fourth proportional to 511.22, 765.20 and 408.62 is: 611.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.22 : 765.20 = 408.62 : x
  2. Step 2: Convert to fraction form
    511.22/765.20 = 408.62/x
  3. Step 3: Cross multiply
    511.22x = 765.20 × 408.62
  4. Step 4: Simplify right side
    511.22x = 312,676.02
  5. Step 5: Solve for x
    x = 312,676.02/511.22
  6. Step 6: Final answer
    x = 611.63

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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.