Home / 5,413.80-8,120.69-1,309.80

Finding the Fourth Proportional to 5,413.80, 8,120.69 and 1,309.80

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Solution

The fourth proportional to 5,413.80, 8,120.69 and 1,309.80 is: 1,964.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,413.80 : 8,120.69 = 1,309.80 : x
  2. Step 2: Convert to fraction form
    5,413.80/8,120.69 = 1,309.80/x
  3. Step 3: Cross multiply
    5,413.80x = 8,120.69 × 1,309.80
  4. Step 4: Simplify right side
    5,413.80x = 10,636,479.76
  5. Step 5: Solve for x
    x = 10,636,479.76/5,413.80
  6. Step 6: Final answer
    x = 1,964.70

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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.