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Finding the Fourth Proportional to 1,413.94, 2,120.40 and 489.22

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Solution

The fourth proportional to 1,413.94, 2,120.40 and 489.22 is: 733.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.94 : 2,120.40 = 489.22 : x
  2. Step 2: Convert to fraction form
    1,413.94/2,120.40 = 489.22/x
  3. Step 3: Cross multiply
    1,413.94x = 2,120.40 × 489.22
  4. Step 4: Simplify right side
    1,413.94x = 1,037,342.09
  5. Step 5: Solve for x
    x = 1,037,342.09/1,413.94
  6. Step 6: Final answer
    x = 733.65

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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.