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Finding the Fourth Proportional to 321.85, 443.91 and 209.98

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Solution

The fourth proportional to 321.85, 443.91 and 209.98 is: 289.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.85 : 443.91 = 209.98 : x
  2. Step 2: Convert to fraction form
    321.85/443.91 = 209.98/x
  3. Step 3: Cross multiply
    321.85x = 443.91 × 209.98
  4. Step 4: Simplify right side
    321.85x = 93,212.22
  5. Step 5: Solve for x
    x = 93,212.22/321.85
  6. Step 6: Final answer
    x = 289.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.