Finding the Fourth Proportional to 81,361.80, 121,880.70 and 71,620.20
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Solution
The fourth proportional to 81,361.80, 121,880.70 and 71,620.20 is: 107,287.70
Step by Step Solution
- Step 1: Write the proportion equation
81,361.80 : 121,880.70 = 71,620.20 : x - Step 2: Convert to fraction form
81,361.80/121,880.70 = 71,620.20/x - Step 3: Cross multiply
81,361.80x = 121,880.70 × 71,620.20 - Step 4: Simplify right side
81,361.80x = 8,729,120,110.14 - Step 5: Solve for x
x = 8,729,120,110.14/81,361.80 - Step 6: Final answer
x = 107,287.70
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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.