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Finding the Fourth Proportional to 18,986.41, 28,479.62 and 8,453.73

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Solution

The fourth proportional to 18,986.41, 28,479.62 and 8,453.73 is: 12,680.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.41 : 28,479.62 = 8,453.73 : x
  2. Step 2: Convert to fraction form
    18,986.41/28,479.62 = 8,453.73/x
  3. Step 3: Cross multiply
    18,986.41x = 28,479.62 × 8,453.73
  4. Step 4: Simplify right side
    18,986.41x = 240,759,145.92
  5. Step 5: Solve for x
    x = 240,759,145.92/18,986.41
  6. Step 6: Final answer
    x = 12,680.60

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Similar ratio
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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.