Finding the Fourth Proportional to 129.90, 178.97 and 122.07
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Solution
The fourth proportional to 129.90, 178.97 and 122.07 is: 168.18
Step by Step Solution
- Step 1: Write the proportion equation
129.90 : 178.97 = 122.07 : x - Step 2: Convert to fraction form
129.90/178.97 = 122.07/x - Step 3: Cross multiply
129.90x = 178.97 × 122.07 - Step 4: Simplify right side
129.90x = 21,846.26 - Step 5: Solve for x
x = 21,846.26/129.90 - Step 6: Final answer
x = 168.18
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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.