Finding the Fourth Proportional to 129,575.09, 178,816.58 and 72,220.31
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Solution
The fourth proportional to 129,575.09, 178,816.58 and 72,220.31 is: 99,665.67
Step by Step Solution
- Step 1: Write the proportion equation
129,575.09 : 178,816.58 = 72,220.31 : x - Step 2: Convert to fraction form
129,575.09/178,816.58 = 72,220.31/x - Step 3: Cross multiply
129,575.09x = 178,816.58 × 72,220.31 - Step 4: Simplify right side
129,575.09x = 12,914,187,585.56 - Step 5: Solve for x
x = 12,914,187,585.56/129,575.09 - Step 6: Final answer
x = 99,665.67
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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.