Finding the Fourth Proportional to 187.31, 258.52 and 121.96
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Solution
The fourth proportional to 187.31, 258.52 and 121.96 is: 168.32
Step by Step Solution
- Step 1: Write the proportion equation
187.31 : 258.52 = 121.96 : x - Step 2: Convert to fraction form
187.31/258.52 = 121.96/x - Step 3: Cross multiply
187.31x = 258.52 × 121.96 - Step 4: Simplify right side
187.31x = 31,527.55 - Step 5: Solve for x
x = 31,527.55/187.31 - Step 6: Final answer
x = 168.32
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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.