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Finding the Fourth Proportional to 418.81, 578.21 and 325.38

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Solution

The fourth proportional to 418.81, 578.21 and 325.38 is: 449.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.81 : 578.21 = 325.38 : x
  2. Step 2: Convert to fraction form
    418.81/578.21 = 325.38/x
  3. Step 3: Cross multiply
    418.81x = 578.21 × 325.38
  4. Step 4: Simplify right side
    418.81x = 188,137.97
  5. Step 5: Solve for x
    x = 188,137.97/418.81
  6. Step 6: Final answer
    x = 449.22

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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.