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Finding the Fourth Proportional to 778.88, 1,168.08 and 408.44

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Solution

The fourth proportional to 778.88, 1,168.08 and 408.44 is: 612.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.88 : 1,168.08 = 408.44 : x
  2. Step 2: Convert to fraction form
    778.88/1,168.08 = 408.44/x
  3. Step 3: Cross multiply
    778.88x = 1,168.08 × 408.44
  4. Step 4: Simplify right side
    778.88x = 477,090.60
  5. Step 5: Solve for x
    x = 477,090.60/778.88
  6. Step 6: Final answer
    x = 612.53

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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.