Finding the Fourth Proportional to 77.18, 115.01 and 74.75
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Solution
The fourth proportional to 77.18, 115.01 and 74.75 is: 111.39
Step by Step Solution
- Step 1: Write the proportion equation
77.18 : 115.01 = 74.75 : x - Step 2: Convert to fraction form
77.18/115.01 = 74.75/x - Step 3: Cross multiply
77.18x = 115.01 × 74.75 - Step 4: Simplify right side
77.18x = 8,597.00 - Step 5: Solve for x
x = 8,597.00/77.18 - Step 6: Final answer
x = 111.39
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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.