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Finding the Fourth Proportional to 321.80, 443.98 and 228.56

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Solution

The fourth proportional to 321.80, 443.98 and 228.56 is: 315.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.80 : 443.98 = 228.56 : x
  2. Step 2: Convert to fraction form
    321.80/443.98 = 228.56/x
  3. Step 3: Cross multiply
    321.80x = 443.98 × 228.56
  4. Step 4: Simplify right side
    321.80x = 101,476.07
  5. Step 5: Solve for x
    x = 101,476.07/321.80
  6. Step 6: Final answer
    x = 315.34

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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.