Finding the Fourth Proportional to 84.68, 126.26 and 81.68
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Solution
The fourth proportional to 84.68, 126.26 and 81.68 is: 121.79
Step by Step Solution
- Step 1: Write the proportion equation
84.68 : 126.26 = 81.68 : x - Step 2: Convert to fraction form
84.68/126.26 = 81.68/x - Step 3: Cross multiply
84.68x = 126.26 × 81.68 - Step 4: Simplify right side
84.68x = 10,312.92 - Step 5: Solve for x
x = 10,312.92/84.68 - Step 6: Final answer
x = 121.79
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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.