Finding the Fourth Proportional to 121.09, 167.09 and 74.44
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Solution
The fourth proportional to 121.09, 167.09 and 74.44 is: 102.72
Step by Step Solution
- Step 1: Write the proportion equation
121.09 : 167.09 = 74.44 : x - Step 2: Convert to fraction form
121.09/167.09 = 74.44/x - Step 3: Cross multiply
121.09x = 167.09 × 74.44 - Step 4: Simplify right side
121.09x = 12,438.18 - Step 5: Solve for x
x = 12,438.18/121.09 - Step 6: Final answer
x = 102.72
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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.