Finding the Fourth Proportional to 121.49, 167.69 and 71.69
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Solution
The fourth proportional to 121.49, 167.69 and 71.69 is: 98.96
Step by Step Solution
- Step 1: Write the proportion equation
121.49 : 167.69 = 71.69 : x - Step 2: Convert to fraction form
121.49/167.69 = 71.69/x - Step 3: Cross multiply
121.49x = 167.69 × 71.69 - Step 4: Simplify right side
121.49x = 12,022.00 - Step 5: Solve for x
x = 12,022.00/121.49 - Step 6: Final answer
x = 98.96
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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.