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Finding the Fourth Proportional to 1,290.78, 1,936.00 and 413.37

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Solution

The fourth proportional to 1,290.78, 1,936.00 and 413.37 is: 620.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.78 : 1,936.00 = 413.37 : x
  2. Step 2: Convert to fraction form
    1,290.78/1,936.00 = 413.37/x
  3. Step 3: Cross multiply
    1,290.78x = 1,936.00 × 413.37
  4. Step 4: Simplify right side
    1,290.78x = 800,284.84
  5. Step 5: Solve for x
    x = 800,284.84/1,290.78
  6. Step 6: Final answer
    x = 620.00

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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.