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Finding the Fourth Proportional to 8,413.90, 12,619.40 and 2,790.88

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Solution

The fourth proportional to 8,413.90, 12,619.40 and 2,790.88 is: 4,185.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,413.90 : 12,619.40 = 2,790.88 : x
  2. Step 2: Convert to fraction form
    8,413.90/12,619.40 = 2,790.88/x
  3. Step 3: Cross multiply
    8,413.90x = 12,619.40 × 2,790.88
  4. Step 4: Simplify right side
    8,413.90x = 35,219,231.07
  5. Step 5: Solve for x
    x = 35,219,231.07/8,413.90
  6. Step 6: Final answer
    x = 4,185.84

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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.