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Finding the Fourth Proportional to 321.52, 443.15 and 274.90

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Solution

The fourth proportional to 321.52, 443.15 and 274.90 is: 378.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.52 : 443.15 = 274.90 : x
  2. Step 2: Convert to fraction form
    321.52/443.15 = 274.90/x
  3. Step 3: Cross multiply
    321.52x = 443.15 × 274.90
  4. Step 4: Simplify right side
    321.52x = 121,821.94
  5. Step 5: Solve for x
    x = 121,821.94/321.52
  6. Step 6: Final answer
    x = 378.89

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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.