Finding the Fourth Proportional to 128.05, 192.20 and 55.96
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Solution
The fourth proportional to 128.05, 192.20 and 55.96 is: 83.99
Step by Step Solution
- Step 1: Write the proportion equation
128.05 : 192.20 = 55.96 : x - Step 2: Convert to fraction form
128.05/192.20 = 55.96/x - Step 3: Cross multiply
128.05x = 192.20 × 55.96 - Step 4: Simplify right side
128.05x = 10,755.51 - Step 5: Solve for x
x = 10,755.51/128.05 - Step 6: Final answer
x = 83.99
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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.