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Finding the Fourth Proportional to 1,290.71, 1,936.17 and 413.33

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Solution

The fourth proportional to 1,290.71, 1,936.17 and 413.33 is: 620.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.71 : 1,936.17 = 413.33 : x
  2. Step 2: Convert to fraction form
    1,290.71/1,936.17 = 413.33/x
  3. Step 3: Cross multiply
    1,290.71x = 1,936.17 × 413.33
  4. Step 4: Simplify right side
    1,290.71x = 800,277.15
  5. Step 5: Solve for x
    x = 800,277.15/1,290.71
  6. Step 6: Final answer
    x = 620.03

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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.