Finding the Fourth Proportional to 108.68, 163.11 and 78.26
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Solution
The fourth proportional to 108.68, 163.11 and 78.26 is: 117.45
Step by Step Solution
- Step 1: Write the proportion equation
108.68 : 163.11 = 78.26 : x - Step 2: Convert to fraction form
108.68/163.11 = 78.26/x - Step 3: Cross multiply
108.68x = 163.11 × 78.26 - Step 4: Simplify right side
108.68x = 12,764.99 - Step 5: Solve for x
x = 12,764.99/108.68 - Step 6: Final answer
x = 117.45
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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.