Finding the Fourth Proportional to 128,344.20, 177,116.16 and 71,755.68
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Solution
The fourth proportional to 128,344.20, 177,116.16 and 71,755.68 is: 99,023.49
Step by Step Solution
- Step 1: Write the proportion equation
128,344.20 : 177,116.16 = 71,755.68 : x - Step 2: Convert to fraction form
128,344.20/177,116.16 = 71,755.68/x - Step 3: Cross multiply
128,344.20x = 177,116.16 × 71,755.68 - Step 4: Simplify right side
128,344.20x = 12,709,090,499.79 - Step 5: Solve for x
x = 12,709,090,499.79/128,344.20 - Step 6: Final answer
x = 99,023.49
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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.