Finding the Fourth Proportional to 138.44, 207.20 and 84.40
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Solution
The fourth proportional to 138.44, 207.20 and 84.40 is: 126.32
Step by Step Solution
- Step 1: Write the proportion equation
138.44 : 207.20 = 84.40 : x - Step 2: Convert to fraction form
138.44/207.20 = 84.40/x - Step 3: Cross multiply
138.44x = 207.20 × 84.40 - Step 4: Simplify right side
138.44x = 17,487.68 - Step 5: Solve for x
x = 17,487.68/138.44 - Step 6: Final answer
x = 126.32
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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.