Finding the Fourth Proportional to 76.12, 113.62 and 66.99
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Solution
The fourth proportional to 76.12, 113.62 and 66.99 is: 99.99
Step by Step Solution
- Step 1: Write the proportion equation
76.12 : 113.62 = 66.99 : x - Step 2: Convert to fraction form
76.12/113.62 = 66.99/x - Step 3: Cross multiply
76.12x = 113.62 × 66.99 - Step 4: Simplify right side
76.12x = 7,611.40 - Step 5: Solve for x
x = 7,611.40/76.12 - Step 6: Final answer
x = 99.99
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.