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Finding the Fourth Proportional to 3,413.86, 4,710.92 and 1,921.72

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Solution

The fourth proportional to 3,413.86, 4,710.92 and 1,921.72 is: 2,651.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,413.86 : 4,710.92 = 1,921.72 : x
  2. Step 2: Convert to fraction form
    3,413.86/4,710.92 = 1,921.72/x
  3. Step 3: Cross multiply
    3,413.86x = 4,710.92 × 1,921.72
  4. Step 4: Simplify right side
    3,413.86x = 9,053,069.18
  5. Step 5: Solve for x
    x = 9,053,069.18/3,413.86
  6. Step 6: Final answer
    x = 2,651.86

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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.