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Finding the Fourth Proportional to 503.21, 755.12 and 320.76

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Solution

The fourth proportional to 503.21, 755.12 and 320.76 is: 481.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.21 : 755.12 = 320.76 : x
  2. Step 2: Convert to fraction form
    503.21/755.12 = 320.76/x
  3. Step 3: Cross multiply
    503.21x = 755.12 × 320.76
  4. Step 4: Simplify right side
    503.21x = 242,213.09
  5. Step 5: Solve for x
    x = 242,213.09/503.21
  6. Step 6: Final answer
    x = 481.33

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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.