Finding the Fourth Proportional to 126.68, 189.86 and 80.99
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Solution
The fourth proportional to 126.68, 189.86 and 80.99 is: 121.38
Step by Step Solution
- Step 1: Write the proportion equation
126.68 : 189.86 = 80.99 : x - Step 2: Convert to fraction form
126.68/189.86 = 80.99/x - Step 3: Cross multiply
126.68x = 189.86 × 80.99 - Step 4: Simplify right side
126.68x = 15,376.12 - Step 5: Solve for x
x = 15,376.12/126.68 - Step 6: Final answer
x = 121.38
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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.