Finding the Fourth Proportional to 86,065.20, 129,097.80 and 76,879.80
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Solution
The fourth proportional to 86,065.20, 129,097.80 and 76,879.80 is: 115,319.70
Step by Step Solution
- Step 1: Write the proportion equation
86,065.20 : 129,097.80 = 76,879.80 : x - Step 2: Convert to fraction form
86,065.20/129,097.80 = 76,879.80/x - Step 3: Cross multiply
86,065.20x = 129,097.80 × 76,879.80 - Step 4: Simplify right side
86,065.20x = 9,925,013,044.44 - Step 5: Solve for x
x = 9,925,013,044.44/86,065.20 - Step 6: Final answer
x = 115,319.70
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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.