Finding the Fourth Proportional to 8.12, 12.18 and 7.99
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Solution
The fourth proportional to 8.12, 12.18 and 7.99 is: 11.99
Step by Step Solution
- Step 1: Write the proportion equation
8.12 : 12.18 = 7.99 : x - Step 2: Convert to fraction form
8.12/12.18 = 7.99/x - Step 3: Cross multiply
8.12x = 12.18 × 7.99 - Step 4: Simplify right side
8.12x = 97.32 - Step 5: Solve for x
x = 97.32/8.12 - Step 6: Final answer
x = 11.99
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Double scale
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Similar ratio
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1.5x scale
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.