Finding the Fourth Proportional to 122.40, 183.60 and 87.55
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Solution
The fourth proportional to 122.40, 183.60 and 87.55 is: 131.33
Step by Step Solution
- Step 1: Write the proportion equation
122.40 : 183.60 = 87.55 : x - Step 2: Convert to fraction form
122.40/183.60 = 87.55/x - Step 3: Cross multiply
122.40x = 183.60 × 87.55 - Step 4: Simplify right side
122.40x = 16,074.18 - Step 5: Solve for x
x = 16,074.18/122.40 - Step 6: Final answer
x = 131.33
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.