Finding the Fourth Proportional to 128,378.68, 177,161.54 and 71,790.05
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Solution
The fourth proportional to 128,378.68, 177,161.54 and 71,790.05 is: 99,069.69
Step by Step Solution
- Step 1: Write the proportion equation
128,378.68 : 177,161.54 = 71,790.05 : x - Step 2: Convert to fraction form
128,378.68/177,161.54 = 71,790.05/x - Step 3: Cross multiply
128,378.68x = 177,161.54 × 71,790.05 - Step 4: Simplify right side
128,378.68x = 12,718,435,898.63 - Step 5: Solve for x
x = 12,718,435,898.63/128,378.68 - Step 6: Final answer
x = 99,069.69
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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.