Finding the Fourth Proportional to 20.82, 28.71 and 18.12
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Solution
The fourth proportional to 20.82, 28.71 and 18.12 is: 24.99
Step by Step Solution
- Step 1: Write the proportion equation
20.82 : 28.71 = 18.12 : x - Step 2: Convert to fraction form
20.82/28.71 = 18.12/x - Step 3: Cross multiply
20.82x = 28.71 × 18.12 - Step 4: Simplify right side
20.82x = 520.23 - Step 5: Solve for x
x = 520.23/20.82 - Step 6: Final answer
x = 24.99
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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.