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Finding the Fourth Proportional to 389.75, 584.11 and 206.75

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Solution

The fourth proportional to 389.75, 584.11 and 206.75 is: 309.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.75 : 584.11 = 206.75 : x
  2. Step 2: Convert to fraction form
    389.75/584.11 = 206.75/x
  3. Step 3: Cross multiply
    389.75x = 584.11 × 206.75
  4. Step 4: Simplify right side
    389.75x = 120,766.46
  5. Step 5: Solve for x
    x = 120,766.46/389.75
  6. Step 6: Final answer
    x = 309.85

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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.