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Finding the Fourth Proportional to 321.63, 443.79 and 223.35

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Solution

The fourth proportional to 321.63, 443.79 and 223.35 is: 308.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.63 : 443.79 = 223.35 : x
  2. Step 2: Convert to fraction form
    321.63/443.79 = 223.35/x
  3. Step 3: Cross multiply
    321.63x = 443.79 × 223.35
  4. Step 4: Simplify right side
    321.63x = 99,120.50
  5. Step 5: Solve for x
    x = 99,120.50/321.63
  6. Step 6: Final answer
    x = 308.18

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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.