Finding the Fourth Proportional to 89.98, 134.41 and 81.88
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Solution
The fourth proportional to 89.98, 134.41 and 81.88 is: 122.31
Step by Step Solution
- Step 1: Write the proportion equation
89.98 : 134.41 = 81.88 : x - Step 2: Convert to fraction form
89.98/134.41 = 81.88/x - Step 3: Cross multiply
89.98x = 134.41 × 81.88 - Step 4: Simplify right side
89.98x = 11,005.49 - Step 5: Solve for x
x = 11,005.49/89.98 - Step 6: Final answer
x = 122.31
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.