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Finding the Fourth Proportional to 449.75, 620.61 and 331.79

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Solution

The fourth proportional to 449.75, 620.61 and 331.79 is: 457.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.75 : 620.61 = 331.79 : x
  2. Step 2: Convert to fraction form
    449.75/620.61 = 331.79/x
  3. Step 3: Cross multiply
    449.75x = 620.61 × 331.79
  4. Step 4: Simplify right side
    449.75x = 205,913.47
  5. Step 5: Solve for x
    x = 205,913.47/449.75
  6. Step 6: Final answer
    x = 457.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.