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Finding the Fourth Proportional to 18,965.16, 28,413.63 and 12,375

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Solution

The fourth proportional to 18,965.16, 28,413.63 and 12,375 is: 18,540.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,965.16 : 28,413.63 = 12,375 : x
  2. Step 2: Convert to fraction form
    18,965.16/28,413.63 = 12,375/x
  3. Step 3: Cross multiply
    18,965.16x = 28,413.63 × 12,375
  4. Step 4: Simplify right side
    18,965.16x = 351,618,671.25
  5. Step 5: Solve for x
    x = 351,618,671.25/18,965.16
  6. Step 6: Final answer
    x = 18,540.24

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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.