Finding the Fourth Proportional to 138,628.26, 206,939.61 and 121,813.20
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Solution
The fourth proportional to 138,628.26, 206,939.61 and 121,813.20 is: 181,838.65
Step by Step Solution
- Step 1: Write the proportion equation
138,628.26 : 206,939.61 = 121,813.20 : x - Step 2: Convert to fraction form
138,628.26/206,939.61 = 121,813.20/x - Step 3: Cross multiply
138,628.26x = 206,939.61 × 121,813.20 - Step 4: Simplify right side
138,628.26x = 25,207,976,100.85 - Step 5: Solve for x
x = 25,207,976,100.85/138,628.26 - Step 6: Final answer
x = 181,838.65
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.