Finding the Fourth Proportional to 163.20, 221.28 and 163.20
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Solution
The fourth proportional to 163.20, 221.28 and 163.20 is: 221.28
Step by Step Solution
- Step 1: Write the proportion equation
163.20 : 221.28 = 163.20 : x - Step 2: Convert to fraction form
163.20/221.28 = 163.20/x - Step 3: Cross multiply
163.20x = 221.28 × 163.20 - Step 4: Simplify right side
163.20x = 36,112.90 - Step 5: Solve for x
x = 36,112.90/163.20 - Step 6: Final answer
x = 221.28
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Why These Related Problems?
These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.