Finding the Fourth Proportional to 121.96, 182.68 and 81.28
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Solution
The fourth proportional to 121.96, 182.68 and 81.28 is: 121.75
Step by Step Solution
- Step 1: Write the proportion equation
121.96 : 182.68 = 81.28 : x - Step 2: Convert to fraction form
121.96/182.68 = 81.28/x - Step 3: Cross multiply
121.96x = 182.68 × 81.28 - Step 4: Simplify right side
121.96x = 14,848.23 - Step 5: Solve for x
x = 14,848.23/121.96 - Step 6: Final answer
x = 121.75
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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.