Finding the Fourth Proportional to 86,821.80, 130,232.70 and 21,157.80
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Solution
The fourth proportional to 86,821.80, 130,232.70 and 21,157.80 is: 31,736.70
Step by Step Solution
- Step 1: Write the proportion equation
86,821.80 : 130,232.70 = 21,157.80 : x - Step 2: Convert to fraction form
86,821.80/130,232.70 = 21,157.80/x - Step 3: Cross multiply
86,821.80x = 130,232.70 × 21,157.80 - Step 4: Simplify right side
86,821.80x = 2,755,437,420.06 - Step 5: Solve for x
x = 2,755,437,420.06/86,821.80 - Step 6: Final answer
x = 31,736.70
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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.