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Finding the Fourth Proportional to 628.37, 940.32 and 408.86

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Solution

The fourth proportional to 628.37, 940.32 and 408.86 is: 611.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.37 : 940.32 = 408.86 : x
  2. Step 2: Convert to fraction form
    628.37/940.32 = 408.86/x
  3. Step 3: Cross multiply
    628.37x = 940.32 × 408.86
  4. Step 4: Simplify right side
    628.37x = 384,452.49
  5. Step 5: Solve for x
    x = 384,452.49/628.37
  6. Step 6: Final answer
    x = 611.83

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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.