Finding the Fourth Proportional to 129.63, 178.91 and 92.36
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Solution
The fourth proportional to 129.63, 178.91 and 92.36 is: 127.47
Step by Step Solution
- Step 1: Write the proportion equation
129.63 : 178.91 = 92.36 : x - Step 2: Convert to fraction form
129.63/178.91 = 92.36/x - Step 3: Cross multiply
129.63x = 178.91 × 92.36 - Step 4: Simplify right side
129.63x = 16,524.13 - Step 5: Solve for x
x = 16,524.13/129.63 - Step 6: Final answer
x = 127.47
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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.