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Finding the Fourth Proportional to 386.37, 578.88 and 203.85

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Solution

The fourth proportional to 386.37, 578.88 and 203.85 is: 305.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.37 : 578.88 = 203.85 : x
  2. Step 2: Convert to fraction form
    386.37/578.88 = 203.85/x
  3. Step 3: Cross multiply
    386.37x = 578.88 × 203.85
  4. Step 4: Simplify right side
    386.37x = 118,004.69
  5. Step 5: Solve for x
    x = 118,004.69/386.37
  6. Step 6: Final answer
    x = 305.42

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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.