Finding the Fourth Proportional to 129,088.99, 178,142.39 and 71,728.08
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Solution
The fourth proportional to 129,088.99, 178,142.39 and 71,728.08 is: 98,984.52
Step by Step Solution
- Step 1: Write the proportion equation
129,088.99 : 178,142.39 = 71,728.08 : x - Step 2: Convert to fraction form
129,088.99/178,142.39 = 71,728.08/x - Step 3: Cross multiply
129,088.99x = 178,142.39 × 71,728.08 - Step 4: Simplify right side
129,088.99x = 12,777,811,845.67 - Step 5: Solve for x
x = 12,777,811,845.67/129,088.99 - Step 6: Final answer
x = 98,984.52
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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.