Finding the Fourth Proportional to 128,725.20, 177,631.08 and 72,125.64
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Solution
The fourth proportional to 128,725.20, 177,631.08 and 72,125.64 is: 99,527.95
Step by Step Solution
- Step 1: Write the proportion equation
128,725.20 : 177,631.08 = 72,125.64 : x - Step 2: Convert to fraction form
128,725.20/177,631.08 = 72,125.64/x - Step 3: Cross multiply
128,725.20x = 177,631.08 × 72,125.64 - Step 4: Simplify right side
128,725.20x = 12,811,755,328.89 - Step 5: Solve for x
x = 12,811,755,328.89/128,725.20 - Step 6: Final answer
x = 99,527.95
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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.