Finding the Fourth Proportional to 128,689.23, 192,153.64 and 115,275.63
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Solution
The fourth proportional to 128,689.23, 192,153.64 and 115,275.63 is: 172,124.99
Step by Step Solution
- Step 1: Write the proportion equation
128,689.23 : 192,153.64 = 115,275.63 : x - Step 2: Convert to fraction form
128,689.23/192,153.64 = 115,275.63/x - Step 3: Cross multiply
128,689.23x = 192,153.64 × 115,275.63 - Step 4: Simplify right side
128,689.23x = 22,150,631,907.79 - Step 5: Solve for x
x = 22,150,631,907.79/128,689.23 - Step 6: Final answer
x = 172,124.99
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.