Finding the Fourth Proportional to 138.18, 207.28 and 69.73
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Solution
The fourth proportional to 138.18, 207.28 and 69.73 is: 104.59
Step by Step Solution
- Step 1: Write the proportion equation
138.18 : 207.28 = 69.73 : x - Step 2: Convert to fraction form
138.18/207.28 = 69.73/x - Step 3: Cross multiply
138.18x = 207.28 × 69.73 - Step 4: Simplify right side
138.18x = 14,453.20 - Step 5: Solve for x
x = 14,453.20/138.18 - Step 6: Final answer
x = 104.59
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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.