Finding the Fourth Proportional to 128,819.80, 177,771.40 and 78,518.80
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Solution
The fourth proportional to 128,819.80, 177,771.40 and 78,518.80 is: 108,355.99
Step by Step Solution
- Step 1: Write the proportion equation
128,819.80 : 177,771.40 = 78,518.80 : x - Step 2: Convert to fraction form
128,819.80/177,771.40 = 78,518.80/x - Step 3: Cross multiply
128,819.80x = 177,771.40 × 78,518.80 - Step 4: Simplify right side
128,819.80x = 13,958,397,002.32 - Step 5: Solve for x
x = 13,958,397,002.32/128,819.80 - Step 6: Final answer
x = 108,355.99
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.