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Finding the Fourth Proportional to 754.28, 1,131.51 and 321.32

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Solution

The fourth proportional to 754.28, 1,131.51 and 321.32 is: 482.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.28 : 1,131.51 = 321.32 : x
  2. Step 2: Convert to fraction form
    754.28/1,131.51 = 321.32/x
  3. Step 3: Cross multiply
    754.28x = 1,131.51 × 321.32
  4. Step 4: Simplify right side
    754.28x = 363,576.79
  5. Step 5: Solve for x
    x = 363,576.79/754.28
  6. Step 6: Final answer
    x = 482.02

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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.