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Finding the Fourth Proportional to 11,900.89, 17,860.30 and 8,143.67

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Solution

The fourth proportional to 11,900.89, 17,860.30 and 8,143.67 is: 12,221.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,900.89 : 17,860.30 = 8,143.67 : x
  2. Step 2: Convert to fraction form
    11,900.89/17,860.30 = 8,143.67/x
  3. Step 3: Cross multiply
    11,900.89x = 17,860.30 × 8,143.67
  4. Step 4: Simplify right side
    11,900.89x = 145,448,413.59
  5. Step 5: Solve for x
    x = 145,448,413.59/11,900.89
  6. Step 6: Final answer
    x = 12,221.64

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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.