Finding the Fourth Proportional to 81.99, 122.18 and 79.92
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Solution
The fourth proportional to 81.99, 122.18 and 79.92 is: 119.09
Step by Step Solution
- Step 1: Write the proportion equation
81.99 : 122.18 = 79.92 : x - Step 2: Convert to fraction form
81.99/122.18 = 79.92/x - Step 3: Cross multiply
81.99x = 122.18 × 79.92 - Step 4: Simplify right side
81.99x = 9,764.23 - Step 5: Solve for x
x = 9,764.23/81.99 - Step 6: Final answer
x = 119.09
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.