Finding the Fourth Proportional to 121.15, 167.25 and 91.99
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Solution
The fourth proportional to 121.15, 167.25 and 91.99 is: 126.99
Step by Step Solution
- Step 1: Write the proportion equation
121.15 : 167.25 = 91.99 : x - Step 2: Convert to fraction form
121.15/167.25 = 91.99/x - Step 3: Cross multiply
121.15x = 167.25 × 91.99 - Step 4: Simplify right side
121.15x = 15,385.33 - Step 5: Solve for x
x = 15,385.33/121.15 - Step 6: Final answer
x = 126.99
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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.