Finding the Fourth Proportional to 138.26, 207.12 and 69.68
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Solution
The fourth proportional to 138.26, 207.12 and 69.68 is: 104.38
Step by Step Solution
- Step 1: Write the proportion equation
138.26 : 207.12 = 69.68 : x - Step 2: Convert to fraction form
138.26/207.12 = 69.68/x - Step 3: Cross multiply
138.26x = 207.12 × 69.68 - Step 4: Simplify right side
138.26x = 14,432.12 - Step 5: Solve for x
x = 14,432.12/138.26 - Step 6: Final answer
x = 104.38
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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.