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Finding the Fourth Proportional to 753.97, 1,131.43 and 321.09

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Solution

The fourth proportional to 753.97, 1,131.43 and 321.09 is: 481.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.97 : 1,131.43 = 321.09 : x
  2. Step 2: Convert to fraction form
    753.97/1,131.43 = 321.09/x
  3. Step 3: Cross multiply
    753.97x = 1,131.43 × 321.09
  4. Step 4: Simplify right side
    753.97x = 363,290.86
  5. Step 5: Solve for x
    x = 363,290.86/753.97
  6. Step 6: Final answer
    x = 481.84

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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.