Finding the Fourth Proportional to 126.92, 189.99 and 81.23
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Solution
The fourth proportional to 126.92, 189.99 and 81.23 is: 121.59
Step by Step Solution
- Step 1: Write the proportion equation
126.92 : 189.99 = 81.23 : x - Step 2: Convert to fraction form
126.92/189.99 = 81.23/x - Step 3: Cross multiply
126.92x = 189.99 × 81.23 - Step 4: Simplify right side
126.92x = 15,431.94 - Step 5: Solve for x
x = 15,431.94/126.92 - Step 6: Final answer
x = 121.59
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.