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Finding the Fourth Proportional to 12,939.92, 19,413.12 and 3,705.92

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Solution

The fourth proportional to 12,939.92, 19,413.12 and 3,705.92 is: 5,559.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.92 : 19,413.12 = 3,705.92 : x
  2. Step 2: Convert to fraction form
    12,939.92/19,413.12 = 3,705.92/x
  3. Step 3: Cross multiply
    12,939.92x = 19,413.12 × 3,705.92
  4. Step 4: Simplify right side
    12,939.92x = 71,943,469.67
  5. Step 5: Solve for x
    x = 71,943,469.67/12,939.92
  6. Step 6: Final answer
    x = 5,559.81

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1.5x scale

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.