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Finding the Fourth Proportional to 5,413.80, 8,120.70 and 3,955.80

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Solution

The fourth proportional to 5,413.80, 8,120.70 and 3,955.80 is: 5,933.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,413.80 : 8,120.70 = 3,955.80 : x
  2. Step 2: Convert to fraction form
    5,413.80/8,120.70 = 3,955.80/x
  3. Step 3: Cross multiply
    5,413.80x = 8,120.70 × 3,955.80
  4. Step 4: Simplify right side
    5,413.80x = 32,123,865.06
  5. Step 5: Solve for x
    x = 32,123,865.06/5,413.80
  6. Step 6: Final answer
    x = 5,933.70

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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.