Finding the Fourth Proportional to 86,561.96, 129,589.86 and 78,261.08
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Solution
The fourth proportional to 86,561.96, 129,589.86 and 78,261.08 is: 117,162.81
Step by Step Solution
- Step 1: Write the proportion equation
86,561.96 : 129,589.86 = 78,261.08 : x - Step 2: Convert to fraction form
86,561.96/129,589.86 = 78,261.08/x - Step 3: Cross multiply
86,561.96x = 129,589.86 × 78,261.08 - Step 4: Simplify right side
86,561.96x = 10,141,842,400.65 - Step 5: Solve for x
x = 10,141,842,400.65/86,561.96 - Step 6: Final answer
x = 117,162.81
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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.