Finding the Fourth Proportional to 100,436.05, 138,610.36 and 55,122.79
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Solution
The fourth proportional to 100,436.05, 138,610.36 and 55,122.79 is: 76,074.18
Step by Step Solution
- Step 1: Write the proportion equation
100,436.05 : 138,610.36 = 55,122.79 : x - Step 2: Convert to fraction form
100,436.05/138,610.36 = 55,122.79/x - Step 3: Cross multiply
100,436.05x = 138,610.36 × 55,122.79 - Step 4: Simplify right side
100,436.05x = 7,640,589,766.10 - Step 5: Solve for x
x = 7,640,589,766.10/100,436.05 - Step 6: Final answer
x = 76,074.18
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.