Finding the Fourth Proportional to 128,159.10, 192,129.60 and 78,274.19
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Solution
The fourth proportional to 128,159.10, 192,129.60 and 78,274.19 is: 117,344.68
Step by Step Solution
- Step 1: Write the proportion equation
128,159.10 : 192,129.60 = 78,274.19 : x - Step 2: Convert to fraction form
128,159.10/192,129.60 = 78,274.19/x - Step 3: Cross multiply
128,159.10x = 192,129.60 × 78,274.19 - Step 4: Simplify right side
128,159.10x = 15,038,788,815.02 - Step 5: Solve for x
x = 15,038,788,815.02/128,159.10 - Step 6: Final answer
x = 117,344.68
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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.