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Finding the Fourth Proportional to 321.98, 480.64 and 299.48

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Solution

The fourth proportional to 321.98, 480.64 and 299.48 is: 447.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.98 : 480.64 = 299.48 : x
  2. Step 2: Convert to fraction form
    321.98/480.64 = 299.48/x
  3. Step 3: Cross multiply
    321.98x = 480.64 × 299.48
  4. Step 4: Simplify right side
    321.98x = 143,942.07
  5. Step 5: Solve for x
    x = 143,942.07/321.98
  6. Step 6: Final answer
    x = 447.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.