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Finding the Fourth Proportional to 408.54, 613.43 and 391.26

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Solution

The fourth proportional to 408.54, 613.43 and 391.26 is: 587.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.54 : 613.43 = 391.26 : x
  2. Step 2: Convert to fraction form
    408.54/613.43 = 391.26/x
  3. Step 3: Cross multiply
    408.54x = 613.43 × 391.26
  4. Step 4: Simplify right side
    408.54x = 240,008.67
  5. Step 5: Solve for x
    x = 240,008.67/408.54
  6. Step 6: Final answer
    x = 587.48

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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.