Finding the Fourth Proportional to 81,691.40, 122,537.10 and 40,129.80
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Solution
The fourth proportional to 81,691.40, 122,537.10 and 40,129.80 is: 60,194.70
Step by Step Solution
- Step 1: Write the proportion equation
81,691.40 : 122,537.10 = 40,129.80 : x - Step 2: Convert to fraction form
81,691.40/122,537.10 = 40,129.80/x - Step 3: Cross multiply
81,691.40x = 122,537.10 × 40,129.80 - Step 4: Simplify right side
81,691.40x = 4,917,389,315.58 - Step 5: Solve for x
x = 4,917,389,315.58/81,691.40 - Step 6: Final answer
x = 60,194.70
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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.