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Finding the Fourth Proportional to 513.56, 769.52 and 320.78

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Solution

The fourth proportional to 513.56, 769.52 and 320.78 is: 480.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.56 : 769.52 = 320.78 : x
  2. Step 2: Convert to fraction form
    513.56/769.52 = 320.78/x
  3. Step 3: Cross multiply
    513.56x = 769.52 × 320.78
  4. Step 4: Simplify right side
    513.56x = 246,846.63
  5. Step 5: Solve for x
    x = 246,846.63/513.56
  6. Step 6: Final answer
    x = 480.66

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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.