Finding the Fourth Proportional to 84.28, 126.94 and 76.99
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Solution
The fourth proportional to 84.28, 126.94 and 76.99 is: 115.96
Step by Step Solution
- Step 1: Write the proportion equation
84.28 : 126.94 = 76.99 : x - Step 2: Convert to fraction form
84.28/126.94 = 76.99/x - Step 3: Cross multiply
84.28x = 126.94 × 76.99 - Step 4: Simplify right side
84.28x = 9,772.89 - Step 5: Solve for x
x = 9,772.89/84.28 - Step 6: Final answer
x = 115.96
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.