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Finding the Fourth Proportional to 12,481.88, 18,728.94 and 7,800.68

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Solution

The fourth proportional to 12,481.88, 18,728.94 and 7,800.68 is: 11,704.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,481.88 : 18,728.94 = 7,800.68 : x
  2. Step 2: Convert to fraction form
    12,481.88/18,728.94 = 7,800.68/x
  3. Step 3: Cross multiply
    12,481.88x = 18,728.94 × 7,800.68
  4. Step 4: Simplify right side
    12,481.88x = 146,098,467.68
  5. Step 5: Solve for x
    x = 146,098,467.68/12,481.88
  6. Step 6: Final answer
    x = 11,704.84

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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.