Finding the Fourth Proportional to 126.81, 189.99 and 81.18
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Solution
The fourth proportional to 126.81, 189.99 and 81.18 is: 121.63
Step by Step Solution
- Step 1: Write the proportion equation
126.81 : 189.99 = 81.18 : x - Step 2: Convert to fraction form
126.81/189.99 = 81.18/x - Step 3: Cross multiply
126.81x = 189.99 × 81.18 - Step 4: Simplify right side
126.81x = 15,423.39 - Step 5: Solve for x
x = 15,423.39/126.81 - Step 6: Final answer
x = 121.63
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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.