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Finding the Fourth Proportional to 738.21, 1,107.78 and 413.79

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Solution

The fourth proportional to 738.21, 1,107.78 and 413.79 is: 620.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.21 : 1,107.78 = 413.79 : x
  2. Step 2: Convert to fraction form
    738.21/1,107.78 = 413.79/x
  3. Step 3: Cross multiply
    738.21x = 1,107.78 × 413.79
  4. Step 4: Simplify right side
    738.21x = 458,388.29
  5. Step 5: Solve for x
    x = 458,388.29/738.21
  6. Step 6: Final answer
    x = 620.95

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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.