Finding the Fourth Proportional to 143.44, 197.91 and 81.26
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Solution
The fourth proportional to 143.44, 197.91 and 81.26 is: 112.11
Step by Step Solution
- Step 1: Write the proportion equation
143.44 : 197.91 = 81.26 : x - Step 2: Convert to fraction form
143.44/197.91 = 81.26/x - Step 3: Cross multiply
143.44x = 197.91 × 81.26 - Step 4: Simplify right side
143.44x = 16,081.18 - Step 5: Solve for x
x = 16,081.18/143.44 - Step 6: Final answer
x = 112.11
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.