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Finding the Fourth Proportional to 447.21, 670.08 and 388.79

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Solution

The fourth proportional to 447.21, 670.08 and 388.79 is: 582.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.21 : 670.08 = 388.79 : x
  2. Step 2: Convert to fraction form
    447.21/670.08 = 388.79/x
  3. Step 3: Cross multiply
    447.21x = 670.08 × 388.79
  4. Step 4: Simplify right side
    447.21x = 260,517.05
  5. Step 5: Solve for x
    x = 260,517.05/447.21
  6. Step 6: Final answer
    x = 582.54

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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.