Finding the Fourth Proportional to 86.08, 128.49 and 77.96
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Solution
The fourth proportional to 86.08, 128.49 and 77.96 is: 116.37
Step by Step Solution
- Step 1: Write the proportion equation
86.08 : 128.49 = 77.96 : x - Step 2: Convert to fraction form
86.08/128.49 = 77.96/x - Step 3: Cross multiply
86.08x = 128.49 × 77.96 - Step 4: Simplify right side
86.08x = 10,017.08 - Step 5: Solve for x
x = 10,017.08/86.08 - Step 6: Final answer
x = 116.37
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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.