Finding the Fourth Proportional to 128,518.20, 177,230.70 and 100,213.56
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Solution
The fourth proportional to 128,518.20, 177,230.70 and 100,213.56 is: 138,197.70
Step by Step Solution
- Step 1: Write the proportion equation
128,518.20 : 177,230.70 = 100,213.56 : x - Step 2: Convert to fraction form
128,518.20/177,230.70 = 100,213.56/x - Step 3: Cross multiply
128,518.20x = 177,230.70 × 100,213.56 - Step 4: Simplify right side
128,518.20x = 17,760,919,388.29 - Step 5: Solve for x
x = 17,760,919,388.29/128,518.20 - Step 6: Final answer
x = 138,197.70
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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.