Finding the Fourth Proportional to 128,707.68, 177,616.66 and 78,406.68
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Solution
The fourth proportional to 128,707.68, 177,616.66 and 78,406.68 is: 108,201.26
Step by Step Solution
- Step 1: Write the proportion equation
128,707.68 : 177,616.66 = 78,406.68 : x - Step 2: Convert to fraction form
128,707.68/177,616.66 = 78,406.68/x - Step 3: Cross multiply
128,707.68x = 177,616.66 × 78,406.68 - Step 4: Simplify right side
128,707.68x = 13,926,332,623.29 - Step 5: Solve for x
x = 13,926,332,623.29/128,707.68 - Step 6: Final answer
x = 108,201.26
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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.