Finding the Fourth Proportional to 100,435.05, 138,608.98 and 55,121.79
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Solution
The fourth proportional to 100,435.05, 138,608.98 and 55,121.79 is: 76,072.80
Step by Step Solution
- Step 1: Write the proportion equation
100,435.05 : 138,608.98 = 55,121.79 : x - Step 2: Convert to fraction form
100,435.05/138,608.98 = 55,121.79/x - Step 3: Cross multiply
100,435.05x = 138,608.98 × 55,121.79 - Step 4: Simplify right side
100,435.05x = 7,640,375,087.67 - Step 5: Solve for x
x = 7,640,375,087.67/100,435.05 - Step 6: Final answer
x = 76,072.80
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.