Finding the Fourth Proportional to 118.74, 163.80 and 87.70
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Solution
The fourth proportional to 118.74, 163.80 and 87.70 is: 120.98
Step by Step Solution
- Step 1: Write the proportion equation
118.74 : 163.80 = 87.70 : x - Step 2: Convert to fraction form
118.74/163.80 = 87.70/x - Step 3: Cross multiply
118.74x = 163.80 × 87.70 - Step 4: Simplify right side
118.74x = 14,365.26 - Step 5: Solve for x
x = 14,365.26/118.74 - Step 6: Final answer
x = 120.98
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.