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Finding the Fourth Proportional to 18,918.46, 28,375.68 and 8,388.67

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Solution

The fourth proportional to 18,918.46, 28,375.68 and 8,388.67 is: 12,582.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.46 : 28,375.68 = 8,388.67 : x
  2. Step 2: Convert to fraction form
    18,918.46/28,375.68 = 8,388.67/x
  3. Step 3: Cross multiply
    18,918.46x = 28,375.68 × 8,388.67
  4. Step 4: Simplify right side
    18,918.46x = 238,034,215.55
  5. Step 5: Solve for x
    x = 238,034,215.55/18,918.46
  6. Step 6: Final answer
    x = 12,582.11

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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.