Finding the Fourth Proportional to 129.02, 178.09 and 122.49
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Solution
The fourth proportional to 129.02, 178.09 and 122.49 is: 169.08
Step by Step Solution
- Step 1: Write the proportion equation
129.02 : 178.09 = 122.49 : x - Step 2: Convert to fraction form
129.02/178.09 = 122.49/x - Step 3: Cross multiply
129.02x = 178.09 × 122.49 - Step 4: Simplify right side
129.02x = 21,814.24 - Step 5: Solve for x
x = 21,814.24/129.02 - Step 6: Final answer
x = 169.08
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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.