Finding the Fourth Proportional to 138,165.75, 190,668.74 and 78,549.75
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Solution
The fourth proportional to 138,165.75, 190,668.74 and 78,549.75 is: 108,398.66
Step by Step Solution
- Step 1: Write the proportion equation
138,165.75 : 190,668.74 = 78,549.75 : x - Step 2: Convert to fraction form
138,165.75/190,668.74 = 78,549.75/x - Step 3: Cross multiply
138,165.75x = 190,668.74 × 78,549.75 - Step 4: Simplify right side
138,165.75x = 14,976,981,467.07 - Step 5: Solve for x
x = 14,976,981,467.07/138,165.75 - Step 6: Final answer
x = 108,398.66
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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.