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Finding the Fourth Proportional to 321.71, 443.49 and 228.66

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Solution

The fourth proportional to 321.71, 443.49 and 228.66 is: 315.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.71 : 443.49 = 228.66 : x
  2. Step 2: Convert to fraction form
    321.71/443.49 = 228.66/x
  3. Step 3: Cross multiply
    321.71x = 443.49 × 228.66
  4. Step 4: Simplify right side
    321.71x = 101,408.42
  5. Step 5: Solve for x
    x = 101,408.42/321.71
  6. Step 6: Final answer
    x = 315.22

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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.