Finding the Fourth Proportional to 81,239.20, 121,858.80 and 68,408.80
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Solution
The fourth proportional to 81,239.20, 121,858.80 and 68,408.80 is: 102,613.20
Step by Step Solution
- Step 1: Write the proportion equation
81,239.20 : 121,858.80 = 68,408.80 : x - Step 2: Convert to fraction form
81,239.20/121,858.80 = 68,408.80/x - Step 3: Cross multiply
81,239.20x = 121,858.80 × 68,408.80 - Step 4: Simplify right side
81,239.20x = 8,336,214,277.44 - Step 5: Solve for x
x = 8,336,214,277.44/81,239.20 - Step 6: Final answer
x = 102,613.20
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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.