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Finding the Fourth Proportional to 213.84, 321.21 and 205.38

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Solution

The fourth proportional to 213.84, 321.21 and 205.38 is: 308.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.84 : 321.21 = 205.38 : x
  2. Step 2: Convert to fraction form
    213.84/321.21 = 205.38/x
  3. Step 3: Cross multiply
    213.84x = 321.21 × 205.38
  4. Step 4: Simplify right side
    213.84x = 65,970.11
  5. Step 5: Solve for x
    x = 65,970.11/213.84
  6. Step 6: Final answer
    x = 308.50

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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.