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Finding the Fourth Proportional to 386.12, 578.99 and 223.85

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Solution

The fourth proportional to 386.12, 578.99 and 223.85 is: 335.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.12 : 578.99 = 223.85 : x
  2. Step 2: Convert to fraction form
    386.12/578.99 = 223.85/x
  3. Step 3: Cross multiply
    386.12x = 578.99 × 223.85
  4. Step 4: Simplify right side
    386.12x = 129,604.58
  5. Step 5: Solve for x
    x = 129,604.58/386.12
  6. Step 6: Final answer
    x = 335.66

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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.