Finding the Fourth Proportional to 86,586.10, 129,879.15 and 76,671.70
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Solution
The fourth proportional to 86,586.10, 129,879.15 and 76,671.70 is: 115,007.55
Step by Step Solution
- Step 1: Write the proportion equation
86,586.10 : 129,879.15 = 76,671.70 : x - Step 2: Convert to fraction form
86,586.10/129,879.15 = 76,671.70/x - Step 3: Cross multiply
86,586.10x = 129,879.15 × 76,671.70 - Step 4: Simplify right side
86,586.10x = 9,958,055,225.06 - Step 5: Solve for x
x = 9,958,055,225.06/86,586.10 - Step 6: Final answer
x = 115,007.55
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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.