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Finding the Fourth Proportional to 3,608.75, 5,413.70 and 1,387.50

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Solution

The fourth proportional to 3,608.75, 5,413.70 and 1,387.50 is: 2,081.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,608.75 : 5,413.70 = 1,387.50 : x
  2. Step 2: Convert to fraction form
    3,608.75/5,413.70 = 1,387.50/x
  3. Step 3: Cross multiply
    3,608.75x = 5,413.70 × 1,387.50
  4. Step 4: Simplify right side
    3,608.75x = 7,511,484.11
  5. Step 5: Solve for x
    x = 7,511,484.11/3,608.75
  6. Step 6: Final answer
    x = 2,081.46

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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.