Finding the Fourth Proportional to 81.75, 122.81 and 75.99
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Solution
The fourth proportional to 81.75, 122.81 and 75.99 is: 114.15
Step by Step Solution
- Step 1: Write the proportion equation
81.75 : 122.81 = 75.99 : x - Step 2: Convert to fraction form
81.75/122.81 = 75.99/x - Step 3: Cross multiply
81.75x = 122.81 × 75.99 - Step 4: Simplify right side
81.75x = 9,331.95 - Step 5: Solve for x
x = 9,331.95/81.75 - Step 6: Final answer
x = 114.15
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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.