Finding the Fourth Proportional to 111.98, 168.57 and 86.44
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Solution
The fourth proportional to 111.98, 168.57 and 86.44 is: 130.12
Step by Step Solution
- Step 1: Write the proportion equation
111.98 : 168.57 = 86.44 : x - Step 2: Convert to fraction form
111.98/168.57 = 86.44/x - Step 3: Cross multiply
111.98x = 168.57 × 86.44 - Step 4: Simplify right side
111.98x = 14,571.19 - Step 5: Solve for x
x = 14,571.19/111.98 - Step 6: Final answer
x = 130.12
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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.