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Finding the Fourth Proportional to 3,413.78, 4,711 and 1,921.70

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Solution

The fourth proportional to 3,413.78, 4,711 and 1,921.70 is: 2,651.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,413.78 : 4,711 = 1,921.70 : x
  2. Step 2: Convert to fraction form
    3,413.78/4,711 = 1,921.70/x
  3. Step 3: Cross multiply
    3,413.78x = 4,711 × 1,921.70
  4. Step 4: Simplify right side
    3,413.78x = 9,053,128.70
  5. Step 5: Solve for x
    x = 9,053,128.70/3,413.78
  6. Step 6: Final answer
    x = 2,651.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.