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Finding the Fourth Proportional to 18,884.86, 28,334.97 and 12,138

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Solution

The fourth proportional to 18,884.86, 28,334.97 and 12,138 is: 18,211.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,884.86 : 28,334.97 = 12,138 : x
  2. Step 2: Convert to fraction form
    18,884.86/28,334.97 = 12,138/x
  3. Step 3: Cross multiply
    18,884.86x = 28,334.97 × 12,138
  4. Step 4: Simplify right side
    18,884.86x = 343,929,865.86
  5. Step 5: Solve for x
    x = 343,929,865.86/18,884.86
  6. Step 6: Final answer
    x = 18,211.94

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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.