Finding the Fourth Proportional to 81,163.80, 121,745.70 and 68,722.20
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Solution
The fourth proportional to 81,163.80, 121,745.70 and 68,722.20 is: 103,083.30
Step by Step Solution
- Step 1: Write the proportion equation
81,163.80 : 121,745.70 = 68,722.20 : x - Step 2: Convert to fraction form
81,163.80/121,745.70 = 68,722.20/x - Step 3: Cross multiply
81,163.80x = 121,745.70 × 68,722.20 - Step 4: Simplify right side
81,163.80x = 8,366,632,344.54 - Step 5: Solve for x
x = 8,366,632,344.54/81,163.80 - Step 6: Final answer
x = 103,083.30
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1.5x scale
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.