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Finding the Fourth Proportional to 1,413.55, 2,120.39 and 683.74

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Solution

The fourth proportional to 1,413.55, 2,120.39 and 683.74 is: 1,025.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.55 : 2,120.39 = 683.74 : x
  2. Step 2: Convert to fraction form
    1,413.55/2,120.39 = 683.74/x
  3. Step 3: Cross multiply
    1,413.55x = 2,120.39 × 683.74
  4. Step 4: Simplify right side
    1,413.55x = 1,449,781.44
  5. Step 5: Solve for x
    x = 1,449,781.44/1,413.55
  6. Step 6: Final answer
    x = 1,025.64

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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.