Finding the Fourth Proportional to 84.25, 126.48 and 51.79
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Solution
The fourth proportional to 84.25, 126.48 and 51.79 is: 77.75
Step by Step Solution
- Step 1: Write the proportion equation
84.25 : 126.48 = 51.79 : x - Step 2: Convert to fraction form
84.25/126.48 = 51.79/x - Step 3: Cross multiply
84.25x = 126.48 × 51.79 - Step 4: Simplify right side
84.25x = 6,550.40 - Step 5: Solve for x
x = 6,550.40/84.25 - Step 6: Final answer
x = 77.75
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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.