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Finding the Fourth Proportional to 321.08, 443.66 and 256.12

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Solution

The fourth proportional to 321.08, 443.66 and 256.12 is: 353.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.08 : 443.66 = 256.12 : x
  2. Step 2: Convert to fraction form
    321.08/443.66 = 256.12/x
  3. Step 3: Cross multiply
    321.08x = 443.66 × 256.12
  4. Step 4: Simplify right side
    321.08x = 113,630.20
  5. Step 5: Solve for x
    x = 113,630.20/321.08
  6. Step 6: Final answer
    x = 353.90

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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.