Finding the Fourth Proportional to 75,425.20, 113,129.70 and 20,021.20
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Solution
The fourth proportional to 75,425.20, 113,129.70 and 20,021.20 is: 30,029.65
Step by Step Solution
- Step 1: Write the proportion equation
75,425.20 : 113,129.70 = 20,021.20 : x - Step 2: Convert to fraction form
75,425.20/113,129.70 = 20,021.20/x - Step 3: Cross multiply
75,425.20x = 113,129.70 × 20,021.20 - Step 4: Simplify right side
75,425.20x = 2,264,992,349.64 - Step 5: Solve for x
x = 2,264,992,349.64/75,425.20 - Step 6: Final answer
x = 30,029.65
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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.