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Finding the Fourth Proportional to 578.20, 799.08 and 438.28

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Solution

The fourth proportional to 578.20, 799.08 and 438.28 is: 605.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.20 : 799.08 = 438.28 : x
  2. Step 2: Convert to fraction form
    578.20/799.08 = 438.28/x
  3. Step 3: Cross multiply
    578.20x = 799.08 × 438.28
  4. Step 4: Simplify right side
    578.20x = 350,220.78
  5. Step 5: Solve for x
    x = 350,220.78/578.20
  6. Step 6: Final answer
    x = 605.71

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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.