Finding the Fourth Proportional to 128,419.40, 192,629.10 and 115,329.80
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Solution
The fourth proportional to 128,419.40, 192,629.10 and 115,329.80 is: 172,994.70
Step by Step Solution
- Step 1: Write the proportion equation
128,419.40 : 192,629.10 = 115,329.80 : x - Step 2: Convert to fraction form
128,419.40/192,629.10 = 115,329.80/x - Step 3: Cross multiply
128,419.40x = 192,629.10 × 115,329.80 - Step 4: Simplify right side
128,419.40x = 22,215,875,577.18 - Step 5: Solve for x
x = 22,215,875,577.18/128,419.40 - Step 6: Final answer
x = 172,994.70
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.