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Finding the Fourth Proportional to 309.31, 426.42 and 299.73

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Solution

The fourth proportional to 309.31, 426.42 and 299.73 is: 413.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.31 : 426.42 = 299.73 : x
  2. Step 2: Convert to fraction form
    309.31/426.42 = 299.73/x
  3. Step 3: Cross multiply
    309.31x = 426.42 × 299.73
  4. Step 4: Simplify right side
    309.31x = 127,810.87
  5. Step 5: Solve for x
    x = 127,810.87/309.31
  6. Step 6: Final answer
    x = 413.21

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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.