Finding the Fourth Proportional to 128,861.73, 177,838.07 and 72,276.75
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Solution
The fourth proportional to 128,861.73, 177,838.07 and 72,276.75 is: 99,746.89
Step by Step Solution
- Step 1: Write the proportion equation
128,861.73 : 177,838.07 = 72,276.75 : x - Step 2: Convert to fraction form
128,861.73/177,838.07 = 72,276.75/x - Step 3: Cross multiply
128,861.73x = 177,838.07 × 72,276.75 - Step 4: Simplify right side
128,861.73x = 12,853,557,364.49 - Step 5: Solve for x
x = 12,853,557,364.49/128,861.73 - Step 6: Final answer
x = 99,746.89
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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.