Finding the Fourth Proportional to 18.99, 28.49 and 12.99
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Solution
The fourth proportional to 18.99, 28.49 and 12.99 is: 19.49
Step by Step Solution
- Step 1: Write the proportion equation
18.99 : 28.49 = 12.99 : x - Step 2: Convert to fraction form
18.99/28.49 = 12.99/x - Step 3: Cross multiply
18.99x = 28.49 × 12.99 - Step 4: Simplify right side
18.99x = 370.09 - Step 5: Solve for x
x = 370.09/18.99 - Step 6: Final answer
x = 19.49
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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.