Finding the Fourth Proportional to 109.63, 163.70 and 87.99
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Solution
The fourth proportional to 109.63, 163.70 and 87.99 is: 131.39
Step by Step Solution
- Step 1: Write the proportion equation
109.63 : 163.70 = 87.99 : x - Step 2: Convert to fraction form
109.63/163.70 = 87.99/x - Step 3: Cross multiply
109.63x = 163.70 × 87.99 - Step 4: Simplify right side
109.63x = 14,403.96 - Step 5: Solve for x
x = 14,403.96/109.63 - Step 6: Final answer
x = 131.39
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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.