Finding the Fourth Proportional to 81.49, 122.39 and 79.67
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Solution
The fourth proportional to 81.49, 122.39 and 79.67 is: 119.66
Step by Step Solution
- Step 1: Write the proportion equation
81.49 : 122.39 = 79.67 : x - Step 2: Convert to fraction form
81.49/122.39 = 79.67/x - Step 3: Cross multiply
81.49x = 122.39 × 79.67 - Step 4: Simplify right side
81.49x = 9,750.81 - Step 5: Solve for x
x = 9,750.81/81.49 - Step 6: Final answer
x = 119.66
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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.