Finding the Fourth Proportional to 138.11, 190.62 and 106.99
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Solution
The fourth proportional to 138.11, 190.62 and 106.99 is: 147.67
Step by Step Solution
- Step 1: Write the proportion equation
138.11 : 190.62 = 106.99 : x - Step 2: Convert to fraction form
138.11/190.62 = 106.99/x - Step 3: Cross multiply
138.11x = 190.62 × 106.99 - Step 4: Simplify right side
138.11x = 20,393.96 - Step 5: Solve for x
x = 20,393.96/138.11 - Step 6: Final answer
x = 147.67
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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.