Finding the Fourth Proportional to 81.32, 121.62 and 69.44
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Solution
The fourth proportional to 81.32, 121.62 and 69.44 is: 103.85
Step by Step Solution
- Step 1: Write the proportion equation
81.32 : 121.62 = 69.44 : x - Step 2: Convert to fraction form
81.32/121.62 = 69.44/x - Step 3: Cross multiply
81.32x = 121.62 × 69.44 - Step 4: Simplify right side
81.32x = 8,445.29 - Step 5: Solve for x
x = 8,445.29/81.32 - Step 6: Final answer
x = 103.85
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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.