Finding the Fourth Proportional to 139.05, 191.94 and 83.81
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Solution
The fourth proportional to 139.05, 191.94 and 83.81 is: 115.68
Step by Step Solution
- Step 1: Write the proportion equation
139.05 : 191.94 = 83.81 : x - Step 2: Convert to fraction form
139.05/191.94 = 83.81/x - Step 3: Cross multiply
139.05x = 191.94 × 83.81 - Step 4: Simplify right side
139.05x = 16,085.53 - Step 5: Solve for x
x = 16,085.53/139.05 - Step 6: Final answer
x = 115.68
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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.