Finding the Fourth Proportional to 84.79, 126.97 and 54.28
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Solution
The fourth proportional to 84.79, 126.97 and 54.28 is: 81.28
Step by Step Solution
- Step 1: Write the proportion equation
84.79 : 126.97 = 54.28 : x - Step 2: Convert to fraction form
84.79/126.97 = 54.28/x - Step 3: Cross multiply
84.79x = 126.97 × 54.28 - Step 4: Simplify right side
84.79x = 6,891.93 - Step 5: Solve for x
x = 6,891.93/84.79 - Step 6: Final answer
x = 81.28
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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.