Finding the Fourth Proportional to 92.68, 138.88 and 81.28
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Solution
The fourth proportional to 92.68, 138.88 and 81.28 is: 121.80
Step by Step Solution
- Step 1: Write the proportion equation
92.68 : 138.88 = 81.28 : x - Step 2: Convert to fraction form
92.68/138.88 = 81.28/x - Step 3: Cross multiply
92.68x = 138.88 × 81.28 - Step 4: Simplify right side
92.68x = 11,288.17 - Step 5: Solve for x
x = 11,288.17/92.68 - Step 6: Final answer
x = 121.80
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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.