Finding the Fourth Proportional to 138,660.80, 207,991.20 and 115,332.80
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Solution
The fourth proportional to 138,660.80, 207,991.20 and 115,332.80 is: 172,999.20
Step by Step Solution
- Step 1: Write the proportion equation
138,660.80 : 207,991.20 = 115,332.80 : x - Step 2: Convert to fraction form
138,660.80/207,991.20 = 115,332.80/x - Step 3: Cross multiply
138,660.80x = 207,991.20 × 115,332.80 - Step 4: Simplify right side
138,660.80x = 23,988,207,471.36 - Step 5: Solve for x
x = 23,988,207,471.36/138,660.80 - Step 6: Final answer
x = 172,999.20
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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.