Finding the Fourth Proportional to 129,130.39, 178,198.68 and 71,769.84
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Solution
The fourth proportional to 129,130.39, 178,198.68 and 71,769.84 is: 99,041.68
Step by Step Solution
- Step 1: Write the proportion equation
129,130.39 : 178,198.68 = 71,769.84 : x - Step 2: Convert to fraction form
129,130.39/178,198.68 = 71,769.84/x - Step 3: Cross multiply
129,130.39x = 178,198.68 × 71,769.84 - Step 4: Simplify right side
129,130.39x = 12,789,290,751.81 - Step 5: Solve for x
x = 12,789,290,751.81/129,130.39 - Step 6: Final answer
x = 99,041.68
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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.