Finding the Fourth Proportional to 108.96, 163.20 and 91.68
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Solution
The fourth proportional to 108.96, 163.20 and 91.68 is: 137.32
Step by Step Solution
- Step 1: Write the proportion equation
108.96 : 163.20 = 91.68 : x - Step 2: Convert to fraction form
108.96/163.20 = 91.68/x - Step 3: Cross multiply
108.96x = 163.20 × 91.68 - Step 4: Simplify right side
108.96x = 14,962.18 - Step 5: Solve for x
x = 14,962.18/108.96 - Step 6: Final answer
x = 137.32
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.