Finding the Fourth Proportional to 86,456.64, 129,639.90 and 40,816.68
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Solution
The fourth proportional to 86,456.64, 129,639.90 and 40,816.68 is: 61,203.75
Step by Step Solution
- Step 1: Write the proportion equation
86,456.64 : 129,639.90 = 40,816.68 : x - Step 2: Convert to fraction form
86,456.64/129,639.90 = 40,816.68/x - Step 3: Cross multiply
86,456.64x = 129,639.90 × 40,816.68 - Step 4: Simplify right side
86,456.64x = 5,291,470,313.53 - Step 5: Solve for x
x = 5,291,470,313.53/86,456.64 - Step 6: Final answer
x = 61,203.75
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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.