Finding the Fourth Proportional to 163.20, 243.36 and 148.80
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Solution
The fourth proportional to 163.20, 243.36 and 148.80 is: 221.89
Step by Step Solution
- Step 1: Write the proportion equation
163.20 : 243.36 = 148.80 : x - Step 2: Convert to fraction form
163.20/243.36 = 148.80/x - Step 3: Cross multiply
163.20x = 243.36 × 148.80 - Step 4: Simplify right side
163.20x = 36,211.97 - Step 5: Solve for x
x = 36,211.97/163.20 - Step 6: Final answer
x = 221.89
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.