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Finding the Fourth Proportional to 299.78, 413.57 and 212.30

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Solution

The fourth proportional to 299.78, 413.57 and 212.30 is: 292.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.78 : 413.57 = 212.30 : x
  2. Step 2: Convert to fraction form
    299.78/413.57 = 212.30/x
  3. Step 3: Cross multiply
    299.78x = 413.57 × 212.30
  4. Step 4: Simplify right side
    299.78x = 87,799.85
  5. Step 5: Solve for x
    x = 87,799.85/299.78
  6. Step 6: Final answer
    x = 292.88

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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.