Finding the Fourth Proportional to 81.99, 122.06 and 80.91
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Solution
The fourth proportional to 81.99, 122.06 and 80.91 is: 120.45
Step by Step Solution
- Step 1: Write the proportion equation
81.99 : 122.06 = 80.91 : x - Step 2: Convert to fraction form
81.99/122.06 = 80.91/x - Step 3: Cross multiply
81.99x = 122.06 × 80.91 - Step 4: Simplify right side
81.99x = 9,876.08 - Step 5: Solve for x
x = 9,876.08/81.99 - Step 6: Final answer
x = 120.45
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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.