Finding the Fourth Proportional to 81.28, 121.99 and 54.26
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Solution
The fourth proportional to 81.28, 121.99 and 54.26 is: 81.44
Step by Step Solution
- Step 1: Write the proportion equation
81.28 : 121.99 = 54.26 : x - Step 2: Convert to fraction form
81.28/121.99 = 54.26/x - Step 3: Cross multiply
81.28x = 121.99 × 54.26 - Step 4: Simplify right side
81.28x = 6,619.18 - Step 5: Solve for x
x = 6,619.18/81.28 - Step 6: Final answer
x = 81.44
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.