Finding the Fourth Proportional to 129.09, 177.69 and 92.19
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Solution
The fourth proportional to 129.09, 177.69 and 92.19 is: 126.90
Step by Step Solution
- Step 1: Write the proportion equation
129.09 : 177.69 = 92.19 : x - Step 2: Convert to fraction form
129.09/177.69 = 92.19/x - Step 3: Cross multiply
129.09x = 177.69 × 92.19 - Step 4: Simplify right side
129.09x = 16,381.24 - Step 5: Solve for x
x = 16,381.24/129.09 - Step 6: Final answer
x = 126.90
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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.