Finding the Fourth Proportional to 86,629.13, 129,943.70 and 20,965.13
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Solution
The fourth proportional to 86,629.13, 129,943.70 and 20,965.13 is: 31,447.70
Step by Step Solution
- Step 1: Write the proportion equation
86,629.13 : 129,943.70 = 20,965.13 : x - Step 2: Convert to fraction form
86,629.13/129,943.70 = 20,965.13/x - Step 3: Cross multiply
86,629.13x = 129,943.70 × 20,965.13 - Step 4: Simplify right side
86,629.13x = 2,724,286,563.18 - Step 5: Solve for x
x = 2,724,286,563.18/86,629.13 - Step 6: Final answer
x = 31,447.70
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1.5x scale
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.