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Finding the Fourth Proportional to 15,198.21, 20,975.09 and 8,912.61

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Solution

The fourth proportional to 15,198.21, 20,975.09 and 8,912.61 is: 12,300.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,198.21 : 20,975.09 = 8,912.61 : x
  2. Step 2: Convert to fraction form
    15,198.21/20,975.09 = 8,912.61/x
  3. Step 3: Cross multiply
    15,198.21x = 20,975.09 × 8,912.61
  4. Step 4: Simplify right side
    15,198.21x = 186,942,752.32
  5. Step 5: Solve for x
    x = 186,942,752.32/15,198.21
  6. Step 6: Final answer
    x = 12,300.31

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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.