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Finding the Fourth Proportional to 391.23, 587.22 and 208.75

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Solution

The fourth proportional to 391.23, 587.22 and 208.75 is: 313.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.23 : 587.22 = 208.75 : x
  2. Step 2: Convert to fraction form
    391.23/587.22 = 208.75/x
  3. Step 3: Cross multiply
    391.23x = 587.22 × 208.75
  4. Step 4: Simplify right side
    391.23x = 122,584.44
  5. Step 5: Solve for x
    x = 122,584.44/391.23
  6. Step 6: Final answer
    x = 313.33

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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.