Finding the Fourth Proportional to 138,990.35, 208,716.11 and 86,731.99
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Solution
The fourth proportional to 138,990.35, 208,716.11 and 86,731.99 is: 130,241.87
Step by Step Solution
- Step 1: Write the proportion equation
138,990.35 : 208,716.11 = 86,731.99 : x - Step 2: Convert to fraction form
138,990.35/208,716.11 = 86,731.99/x - Step 3: Cross multiply
138,990.35x = 208,716.11 × 86,731.99 - Step 4: Simplify right side
138,990.35x = 18,102,362,521.78 - Step 5: Solve for x
x = 18,102,362,521.78/138,990.35 - Step 6: Final answer
x = 130,241.87
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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.