Finding the Fourth Proportional to 85,115.80, 128,311.09 and 79,406.92
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Solution
The fourth proportional to 85,115.80, 128,311.09 and 79,406.92 is: 119,705.02
Step by Step Solution
- Step 1: Write the proportion equation
85,115.80 : 128,311.09 = 79,406.92 : x - Step 2: Convert to fraction form
85,115.80/128,311.09 = 79,406.92/x - Step 3: Cross multiply
85,115.80x = 128,311.09 × 79,406.92 - Step 4: Simplify right side
85,115.80x = 10,188,788,458.74 - Step 5: Solve for x
x = 10,188,788,458.74/85,115.80 - Step 6: Final answer
x = 119,705.02
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.