Finding the Fourth Proportional to 128,378.60, 192,203.40 and 121,396.40
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Solution
The fourth proportional to 128,378.60, 192,203.40 and 121,396.40 is: 181,749.92
Step by Step Solution
- Step 1: Write the proportion equation
128,378.60 : 192,203.40 = 121,396.40 : x - Step 2: Convert to fraction form
128,378.60/192,203.40 = 121,396.40/x - Step 3: Cross multiply
128,378.60x = 192,203.40 × 121,396.40 - Step 4: Simplify right side
128,378.60x = 23,332,800,827.76 - Step 5: Solve for x
x = 23,332,800,827.76/128,378.60 - Step 6: Final answer
x = 181,749.92
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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.