Finding the Fourth Proportional to 77.75, 115.99 and 74.95
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Solution
The fourth proportional to 77.75, 115.99 and 74.95 is: 111.81
Step by Step Solution
- Step 1: Write the proportion equation
77.75 : 115.99 = 74.95 : x - Step 2: Convert to fraction form
77.75/115.99 = 74.95/x - Step 3: Cross multiply
77.75x = 115.99 × 74.95 - Step 4: Simplify right side
77.75x = 8,692.87 - Step 5: Solve for x
x = 8,692.87/77.75 - Step 6: Final answer
x = 111.81
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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.