Finding the Fourth Proportional to 86,438.13, 129,657.20 and 20,774.13
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Solution
The fourth proportional to 86,438.13, 129,657.20 and 20,774.13 is: 31,161.20
Step by Step Solution
- Step 1: Write the proportion equation
86,438.13 : 129,657.20 = 20,774.13 : x - Step 2: Convert to fraction form
86,438.13/129,657.20 = 20,774.13/x - Step 3: Cross multiply
86,438.13x = 129,657.20 × 20,774.13 - Step 4: Simplify right side
86,438.13x = 2,693,515,528.24 - Step 5: Solve for x
x = 2,693,515,528.24/86,438.13 - Step 6: Final answer
x = 31,161.20
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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.