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Finding the Fourth Proportional to 386.28, 578.37 and 203.28

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Solution

The fourth proportional to 386.28, 578.37 and 203.28 is: 304.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.28 : 578.37 = 203.28 : x
  2. Step 2: Convert to fraction form
    386.28/578.37 = 203.28/x
  3. Step 3: Cross multiply
    386.28x = 578.37 × 203.28
  4. Step 4: Simplify right side
    386.28x = 117,571.05
  5. Step 5: Solve for x
    x = 117,571.05/386.28
  6. Step 6: Final answer
    x = 304.37

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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.