Finding the Fourth Proportional to 135.91, 203.62 and 81.70
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Solution
The fourth proportional to 135.91, 203.62 and 81.70 is: 122.40
Step by Step Solution
- Step 1: Write the proportion equation
135.91 : 203.62 = 81.70 : x - Step 2: Convert to fraction form
135.91/203.62 = 81.70/x - Step 3: Cross multiply
135.91x = 203.62 × 81.70 - Step 4: Simplify right side
135.91x = 16,635.75 - Step 5: Solve for x
x = 16,635.75/135.91 - Step 6: Final answer
x = 122.40
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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.