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Finding the Fourth Proportional to 321.90, 443.25 and 274.92

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Solution

The fourth proportional to 321.90, 443.25 and 274.92 is: 378.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.90 : 443.25 = 274.92 : x
  2. Step 2: Convert to fraction form
    321.90/443.25 = 274.92/x
  3. Step 3: Cross multiply
    321.90x = 443.25 × 274.92
  4. Step 4: Simplify right side
    321.90x = 121,858.29
  5. Step 5: Solve for x
    x = 121,858.29/321.90
  6. Step 6: Final answer
    x = 378.56

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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.