Finding the Fourth Proportional to 128,163.44, 192,136.11 and 78,278.54
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Solution
The fourth proportional to 128,163.44, 192,136.11 and 78,278.54 is: 117,351.19
Step by Step Solution
- Step 1: Write the proportion equation
128,163.44 : 192,136.11 = 78,278.54 : x - Step 2: Convert to fraction form
128,163.44/192,136.11 = 78,278.54/x - Step 3: Cross multiply
128,163.44x = 192,136.11 × 78,278.54 - Step 4: Simplify right side
128,163.44x = 15,040,132,917.85 - Step 5: Solve for x
x = 15,040,132,917.85/128,163.44 - Step 6: Final answer
x = 117,351.19
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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.