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Finding the Fourth Proportional to 321.71, 443.30 and 228.56

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Solution

The fourth proportional to 321.71, 443.30 and 228.56 is: 314.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.71 : 443.30 = 228.56 : x
  2. Step 2: Convert to fraction form
    321.71/443.30 = 228.56/x
  3. Step 3: Cross multiply
    321.71x = 443.30 × 228.56
  4. Step 4: Simplify right side
    321.71x = 101,317.29
  5. Step 5: Solve for x
    x = 101,317.29/321.71
  6. Step 6: Final answer
    x = 314.94

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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.