Finding the Fourth Proportional to 81.55, 122.21 and 79.08
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Solution
The fourth proportional to 81.55, 122.21 and 79.08 is: 118.52
Step by Step Solution
- Step 1: Write the proportion equation
81.55 : 122.21 = 79.08 : x - Step 2: Convert to fraction form
81.55/122.21 = 79.08/x - Step 3: Cross multiply
81.55x = 122.21 × 79.08 - Step 4: Simplify right side
81.55x = 9,664.84 - Step 5: Solve for x
x = 9,664.84/81.55 - Step 6: Final answer
x = 118.52
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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.