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Finding the Fourth Proportional to 754.83, 1,131.84 and 321.75

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Solution

The fourth proportional to 754.83, 1,131.84 and 321.75 is: 482.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.83 : 1,131.84 = 321.75 : x
  2. Step 2: Convert to fraction form
    754.83/1,131.84 = 321.75/x
  3. Step 3: Cross multiply
    754.83x = 1,131.84 × 321.75
  4. Step 4: Simplify right side
    754.83x = 364,169.52
  5. Step 5: Solve for x
    x = 364,169.52/754.83
  6. Step 6: Final answer
    x = 482.45

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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.