Finding the Fourth Proportional to 129,005.64, 177,942.96 and 81,218.88
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Solution
The fourth proportional to 129,005.64, 177,942.96 and 81,218.88 is: 112,028.65
Step by Step Solution
- Step 1: Write the proportion equation
129,005.64 : 177,942.96 = 81,218.88 : x - Step 2: Convert to fraction form
129,005.64/177,942.96 = 81,218.88/x - Step 3: Cross multiply
129,005.64x = 177,942.96 × 81,218.88 - Step 4: Simplify right side
129,005.64x = 14,452,327,915.08 - Step 5: Solve for x
x = 14,452,327,915.08/129,005.64 - Step 6: Final answer
x = 112,028.65
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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.