Finding the Fourth Proportional to 100,704.36, 138,968.84 and 55,382.21
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Solution
The fourth proportional to 100,704.36, 138,968.84 and 55,382.21 is: 76,425.70
Step by Step Solution
- Step 1: Write the proportion equation
100,704.36 : 138,968.84 = 55,382.21 : x - Step 2: Convert to fraction form
100,704.36/138,968.84 = 55,382.21/x - Step 3: Cross multiply
100,704.36x = 138,968.84 × 55,382.21 - Step 4: Simplify right side
100,704.36x = 7,696,400,993.18 - Step 5: Solve for x
x = 7,696,400,993.18/100,704.36 - Step 6: Final answer
x = 76,425.70
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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.