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Finding the Fourth Proportional to 754.32, 1,131.87 and 321.36

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Solution

The fourth proportional to 754.32, 1,131.87 and 321.36 is: 482.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.32 : 1,131.87 = 321.36 : x
  2. Step 2: Convert to fraction form
    754.32/1,131.87 = 321.36/x
  3. Step 3: Cross multiply
    754.32x = 1,131.87 × 321.36
  4. Step 4: Simplify right side
    754.32x = 363,737.74
  5. Step 5: Solve for x
    x = 363,737.74/754.32
  6. Step 6: Final answer
    x = 482.21

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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.