Finding the Third Proportional to 129 and 155
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Solution
The third proportional to 129 and 155 is: 186.24
Step by Step Solution
- Step 1: Write the proportion equation
129 : 155 = 155 : x - Step 2: Convert to fraction form
129/155 = 155/x - Step 3: Cross multiply
129x = 155 × 155 - Step 4: Simplify right side
129x = 24,025 - Step 5: Solve for x
x = 24,025/129 - Step 6: Final answer
x = 186.24
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Why These Related Problems?
These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.