Finding the Fourth Proportional to 88.11, 121.77 and 77.99
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Solution
The fourth proportional to 88.11, 121.77 and 77.99 is: 107.78
Step by Step Solution
- Step 1: Write the proportion equation
88.11 : 121.77 = 77.99 : x - Step 2: Convert to fraction form
88.11/121.77 = 77.99/x - Step 3: Cross multiply
88.11x = 121.77 × 77.99 - Step 4: Simplify right side
88.11x = 9,496.23 - Step 5: Solve for x
x = 9,496.23/88.11 - Step 6: Final answer
x = 107.78
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.