Finding the Fourth Proportional to 122.51, 169.07 and 80.99
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Solution
The fourth proportional to 122.51, 169.07 and 80.99 is: 111.77
Step by Step Solution
- Step 1: Write the proportion equation
122.51 : 169.07 = 80.99 : x - Step 2: Convert to fraction form
122.51/169.07 = 80.99/x - Step 3: Cross multiply
122.51x = 169.07 × 80.99 - Step 4: Simplify right side
122.51x = 13,692.35 - Step 5: Solve for x
x = 13,692.35/122.51 - Step 6: Final answer
x = 111.77
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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.