Finding the Fourth Proportional to 81.27, 122.08 and 78.99
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Solution
The fourth proportional to 81.27, 122.08 and 78.99 is: 118.65
Step by Step Solution
- Step 1: Write the proportion equation
81.27 : 122.08 = 78.99 : x - Step 2: Convert to fraction form
81.27/122.08 = 78.99/x - Step 3: Cross multiply
81.27x = 122.08 × 78.99 - Step 4: Simplify right side
81.27x = 9,642.90 - Step 5: Solve for x
x = 9,642.90/81.27 - Step 6: Final answer
x = 118.65
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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.