Finding the Fourth Proportional to 81.63, 122.58 and 79.74
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Solution
The fourth proportional to 81.63, 122.58 and 79.74 is: 119.74
Step by Step Solution
- Step 1: Write the proportion equation
81.63 : 122.58 = 79.74 : x - Step 2: Convert to fraction form
81.63/122.58 = 79.74/x - Step 3: Cross multiply
81.63x = 122.58 × 79.74 - Step 4: Simplify right side
81.63x = 9,774.53 - Step 5: Solve for x
x = 9,774.53/81.63 - Step 6: Final answer
x = 119.74
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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.