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Finding the Fourth Proportional to 15,104.65, 20,843.83 and 8,390.70

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Solution

The fourth proportional to 15,104.65, 20,843.83 and 8,390.70 is: 11,578.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,104.65 : 20,843.83 = 8,390.70 : x
  2. Step 2: Convert to fraction form
    15,104.65/20,843.83 = 8,390.70/x
  3. Step 3: Cross multiply
    15,104.65x = 20,843.83 × 8,390.70
  4. Step 4: Simplify right side
    15,104.65x = 174,894,413.03
  5. Step 5: Solve for x
    x = 174,894,413.03/15,104.65
  6. Step 6: Final answer
    x = 11,578.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.