Finding the Fourth Proportional to 128,425.19, 177,217.13 and 71,825.63
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Solution
The fourth proportional to 128,425.19, 177,217.13 and 71,825.63 is: 99,113.98
Step by Step Solution
- Step 1: Write the proportion equation
128,425.19 : 177,217.13 = 71,825.63 : x - Step 2: Convert to fraction form
128,425.19/177,217.13 = 71,825.63/x - Step 3: Cross multiply
128,425.19x = 177,217.13 × 71,825.63 - Step 4: Simplify right side
128,425.19x = 12,728,732,009.04 - Step 5: Solve for x
x = 12,728,732,009.04/128,425.19 - Step 6: Final answer
x = 99,113.98
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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.