Finding the Fourth Proportional to 100,399.69, 138,553.42 and 55,079.99
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Solution
The fourth proportional to 100,399.69, 138,553.42 and 55,079.99 is: 76,011.39
Step by Step Solution
- Step 1: Write the proportion equation
100,399.69 : 138,553.42 = 55,079.99 : x - Step 2: Convert to fraction form
100,399.69/138,553.42 = 55,079.99/x - Step 3: Cross multiply
100,399.69x = 138,553.42 × 55,079.99 - Step 4: Simplify right side
100,399.69x = 7,631,520,157.60 - Step 5: Solve for x
x = 7,631,520,157.60/100,399.69 - Step 6: Final answer
x = 76,011.39
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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.