Finding the Fourth Proportional to 129.20, 177.68 and 122.44
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Solution
The fourth proportional to 129.20, 177.68 and 122.44 is: 168.38
Step by Step Solution
- Step 1: Write the proportion equation
129.20 : 177.68 = 122.44 : x - Step 2: Convert to fraction form
129.20/177.68 = 122.44/x - Step 3: Cross multiply
129.20x = 177.68 × 122.44 - Step 4: Simplify right side
129.20x = 21,755.14 - Step 5: Solve for x
x = 21,755.14/129.20 - Step 6: Final answer
x = 168.38
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.