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Finding the Fourth Proportional to 754.97, 1,131.53 and 321.21

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Solution

The fourth proportional to 754.97, 1,131.53 and 321.21 is: 481.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.97 : 1,131.53 = 321.21 : x
  2. Step 2: Convert to fraction form
    754.97/1,131.53 = 321.21/x
  3. Step 3: Cross multiply
    754.97x = 1,131.53 × 321.21
  4. Step 4: Simplify right side
    754.97x = 363,459.55
  5. Step 5: Solve for x
    x = 363,459.55/754.97
  6. Step 6: Final answer
    x = 481.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.