Finding the Fourth Proportional to 81.74, 121.75 and 79.99
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Solution
The fourth proportional to 81.74, 121.75 and 79.99 is: 119.14
Step by Step Solution
- Step 1: Write the proportion equation
81.74 : 121.75 = 79.99 : x - Step 2: Convert to fraction form
81.74/121.75 = 79.99/x - Step 3: Cross multiply
81.74x = 121.75 × 79.99 - Step 4: Simplify right side
81.74x = 9,738.17 - Step 5: Solve for x
x = 9,738.17/81.74 - Step 6: Final answer
x = 119.14
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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.