Finding the Fourth Proportional to 81.26, 121.07 and 79.08
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Solution
The fourth proportional to 81.26, 121.07 and 79.08 is: 117.83
Step by Step Solution
- Step 1: Write the proportion equation
81.26 : 121.07 = 79.08 : x - Step 2: Convert to fraction form
81.26/121.07 = 79.08/x - Step 3: Cross multiply
81.26x = 121.07 × 79.08 - Step 4: Simplify right side
81.26x = 9,574.72 - Step 5: Solve for x
x = 9,574.72/81.26 - Step 6: Final answer
x = 117.83
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.