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Finding the Fourth Proportional to 512.22, 769.41 and 319.98

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Solution

The fourth proportional to 512.22, 769.41 and 319.98 is: 480.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.22 : 769.41 = 319.98 : x
  2. Step 2: Convert to fraction form
    512.22/769.41 = 319.98/x
  3. Step 3: Cross multiply
    512.22x = 769.41 × 319.98
  4. Step 4: Simplify right side
    512.22x = 246,195.81
  5. Step 5: Solve for x
    x = 246,195.81/512.22
  6. Step 6: Final answer
    x = 480.64

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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.