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Finding the Fourth Proportional to 12,388.68, 18,589.38 and 8,231.54

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Solution

The fourth proportional to 12,388.68, 18,589.38 and 8,231.54 is: 12,351.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,388.68 : 18,589.38 = 8,231.54 : x
  2. Step 2: Convert to fraction form
    12,388.68/18,589.38 = 8,231.54/x
  3. Step 3: Cross multiply
    12,388.68x = 18,589.38 × 8,231.54
  4. Step 4: Simplify right side
    12,388.68x = 153,019,225.05
  5. Step 5: Solve for x
    x = 153,019,225.05/12,388.68
  6. Step 6: Final answer
    x = 12,351.54

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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.