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Finding the Fourth Proportional to 755.61, 1,132.50 and 321.85

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Solution

The fourth proportional to 755.61, 1,132.50 and 321.85 is: 482.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.61 : 1,132.50 = 321.85 : x
  2. Step 2: Convert to fraction form
    755.61/1,132.50 = 321.85/x
  3. Step 3: Cross multiply
    755.61x = 1,132.50 × 321.85
  4. Step 4: Simplify right side
    755.61x = 364,495.13
  5. Step 5: Solve for x
    x = 364,495.13/755.61
  6. Step 6: Final answer
    x = 482.39

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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.