Finding the Fourth Proportional to 121.75, 167.93 and 84.91
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Solution
The fourth proportional to 121.75, 167.93 and 84.91 is: 117.12
Step by Step Solution
- Step 1: Write the proportion equation
121.75 : 167.93 = 84.91 : x - Step 2: Convert to fraction form
121.75/167.93 = 84.91/x - Step 3: Cross multiply
121.75x = 167.93 × 84.91 - Step 4: Simplify right side
121.75x = 14,258.94 - Step 5: Solve for x
x = 14,258.94/121.75 - Step 6: Final answer
x = 117.12
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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.