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Finding the Fourth Proportional to 18,917.46, 28,374.18 and 8,387.67

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Solution

The fourth proportional to 18,917.46, 28,374.18 and 8,387.67 is: 12,580.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.46 : 28,374.18 = 8,387.67 : x
  2. Step 2: Convert to fraction form
    18,917.46/28,374.18 = 8,387.67/x
  3. Step 3: Cross multiply
    18,917.46x = 28,374.18 × 8,387.67
  4. Step 4: Simplify right side
    18,917.46x = 237,993,258.36
  5. Step 5: Solve for x
    x = 237,993,258.36/18,917.46
  6. Step 6: Final answer
    x = 12,580.61

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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.