Finding the Fourth Proportional to 122.74, 183.79 and 86.11
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Solution
The fourth proportional to 122.74, 183.79 and 86.11 is: 128.95
Step by Step Solution
- Step 1: Write the proportion equation
122.74 : 183.79 = 86.11 : x - Step 2: Convert to fraction form
122.74/183.79 = 86.11/x - Step 3: Cross multiply
122.74x = 183.79 × 86.11 - Step 4: Simplify right side
122.74x = 15,827.08 - Step 5: Solve for x
x = 15,827.08/122.74 - Step 6: Final answer
x = 128.95
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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.