Finding the Fourth Proportional to 139.21, 192.11 and 83.99
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Solution
The fourth proportional to 139.21, 192.11 and 83.99 is: 115.91
Step by Step Solution
- Step 1: Write the proportion equation
139.21 : 192.11 = 83.99 : x - Step 2: Convert to fraction form
139.21/192.11 = 83.99/x - Step 3: Cross multiply
139.21x = 192.11 × 83.99 - Step 4: Simplify right side
139.21x = 16,135.38 - Step 5: Solve for x
x = 16,135.38/139.21 - Step 6: Final answer
x = 115.91
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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.