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Finding the Fourth Proportional to 754.84, 1,131.54 and 321.40

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Solution

The fourth proportional to 754.84, 1,131.54 and 321.40 is: 481.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.84 : 1,131.54 = 321.40 : x
  2. Step 2: Convert to fraction form
    754.84/1,131.54 = 321.40/x
  3. Step 3: Cross multiply
    754.84x = 1,131.54 × 321.40
  4. Step 4: Simplify right side
    754.84x = 363,676.96
  5. Step 5: Solve for x
    x = 363,676.96/754.84
  6. Step 6: Final answer
    x = 481.79

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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.