Finding the Fourth Proportional to 129,507.96, 178,716.12 and 72,145.92
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Solution
The fourth proportional to 129,507.96, 178,716.12 and 72,145.92 is: 99,558.66
Step by Step Solution
- Step 1: Write the proportion equation
129,507.96 : 178,716.12 = 72,145.92 : x - Step 2: Convert to fraction form
129,507.96/178,716.12 = 72,145.92/x - Step 3: Cross multiply
129,507.96x = 178,716.12 × 72,145.92 - Step 4: Simplify right side
129,507.96x = 12,893,638,896.23 - Step 5: Solve for x
x = 12,893,638,896.23/129,507.96 - Step 6: Final answer
x = 99,558.66
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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.