Finding the Fourth Proportional to 108.64, 163.61 and 91.63
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Solution
The fourth proportional to 108.64, 163.61 and 91.63 is: 137.99
Step by Step Solution
- Step 1: Write the proportion equation
108.64 : 163.61 = 91.63 : x - Step 2: Convert to fraction form
108.64/163.61 = 91.63/x - Step 3: Cross multiply
108.64x = 163.61 × 91.63 - Step 4: Simplify right side
108.64x = 14,991.13 - Step 5: Solve for x
x = 14,991.13/108.64 - Step 6: Final answer
x = 137.99
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.