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Finding the Fourth Proportional to 216.67, 321.19 and 213.43

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Solution

The fourth proportional to 216.67, 321.19 and 213.43 is: 316.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.67 : 321.19 = 213.43 : x
  2. Step 2: Convert to fraction form
    216.67/321.19 = 213.43/x
  3. Step 3: Cross multiply
    216.67x = 321.19 × 213.43
  4. Step 4: Simplify right side
    216.67x = 68,551.58
  5. Step 5: Solve for x
    x = 68,551.58/216.67
  6. Step 6: Final answer
    x = 316.39

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.