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Finding the Fourth Proportional to 321.61, 443.91 and 256.41

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Solution

The fourth proportional to 321.61, 443.91 and 256.41 is: 353.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.61 : 443.91 = 256.41 : x
  2. Step 2: Convert to fraction form
    321.61/443.91 = 256.41/x
  3. Step 3: Cross multiply
    321.61x = 443.91 × 256.41
  4. Step 4: Simplify right side
    321.61x = 113,822.96
  5. Step 5: Solve for x
    x = 113,822.96/321.61
  6. Step 6: Final answer
    x = 353.92

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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.