Finding the Fourth Proportional to 121.70, 167.77 and 84.75
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Solution
The fourth proportional to 121.70, 167.77 and 84.75 is: 116.83
Step by Step Solution
- Step 1: Write the proportion equation
121.70 : 167.77 = 84.75 : x - Step 2: Convert to fraction form
121.70/167.77 = 84.75/x - Step 3: Cross multiply
121.70x = 167.77 × 84.75 - Step 4: Simplify right side
121.70x = 14,217.98 - Step 5: Solve for x
x = 14,217.98/121.70 - Step 6: Final answer
x = 116.83
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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.