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Finding the Fourth Proportional to 13,321.82, 18,390.78 and 8,287.67

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Solution

The fourth proportional to 13,321.82, 18,390.78 and 8,287.67 is: 11,441.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,321.82 : 18,390.78 = 8,287.67 : x
  2. Step 2: Convert to fraction form
    13,321.82/18,390.78 = 8,287.67/x
  3. Step 3: Cross multiply
    13,321.82x = 18,390.78 × 8,287.67
  4. Step 4: Simplify right side
    13,321.82x = 152,416,623.73
  5. Step 5: Solve for x
    x = 152,416,623.73/13,321.82
  6. Step 6: Final answer
    x = 11,441.13

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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.