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Finding the Fourth Proportional to 1,387.63, 2,081.78 and 413.73

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Solution

The fourth proportional to 1,387.63, 2,081.78 and 413.73 is: 620.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.63 : 2,081.78 = 413.73 : x
  2. Step 2: Convert to fraction form
    1,387.63/2,081.78 = 413.73/x
  3. Step 3: Cross multiply
    1,387.63x = 2,081.78 × 413.73
  4. Step 4: Simplify right side
    1,387.63x = 861,294.84
  5. Step 5: Solve for x
    x = 861,294.84/1,387.63
  6. Step 6: Final answer
    x = 620.69

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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.