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Finding the Fourth Proportional to 321.53, 443.70 and 223.29

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Solution

The fourth proportional to 321.53, 443.70 and 223.29 is: 308.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.53 : 443.70 = 223.29 : x
  2. Step 2: Convert to fraction form
    321.53/443.70 = 223.29/x
  3. Step 3: Cross multiply
    321.53x = 443.70 × 223.29
  4. Step 4: Simplify right side
    321.53x = 99,073.77
  5. Step 5: Solve for x
    x = 99,073.77/321.53
  6. Step 6: Final answer
    x = 308.14

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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.