Finding the Fourth Proportional to 138,412.40, 207,618.60 and 68,428.40
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Solution
The fourth proportional to 138,412.40, 207,618.60 and 68,428.40 is: 102,642.60
Step by Step Solution
- Step 1: Write the proportion equation
138,412.40 : 207,618.60 = 68,428.40 : x - Step 2: Convert to fraction form
138,412.40/207,618.60 = 68,428.40/x - Step 3: Cross multiply
138,412.40x = 207,618.60 × 68,428.40 - Step 4: Simplify right side
138,412.40x = 14,207,008,608.24 - Step 5: Solve for x
x = 14,207,008,608.24/138,412.40 - Step 6: Final answer
x = 102,642.60
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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.