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Finding the Fourth Proportional to 213.98, 321 and 92.27

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Solution

The fourth proportional to 213.98, 321 and 92.27 is: 138.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.98 : 321 = 92.27 : x
  2. Step 2: Convert to fraction form
    213.98/321 = 92.27/x
  3. Step 3: Cross multiply
    213.98x = 321 × 92.27
  4. Step 4: Simplify right side
    213.98x = 29,618.67
  5. Step 5: Solve for x
    x = 29,618.67/213.98
  6. Step 6: Final answer
    x = 138.42

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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.