Finding the Fourth Proportional to 138.70, 208.10 and 133.70
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Solution
The fourth proportional to 138.70, 208.10 and 133.70 is: 200.60
Step by Step Solution
- Step 1: Write the proportion equation
138.70 : 208.10 = 133.70 : x - Step 2: Convert to fraction form
138.70/208.10 = 133.70/x - Step 3: Cross multiply
138.70x = 208.10 × 133.70 - Step 4: Simplify right side
138.70x = 27,822.97 - Step 5: Solve for x
x = 27,822.97/138.70 - Step 6: Final answer
x = 200.60
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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.