Finding the Fourth Proportional to 80,885.40, 121,328.10 and 78,163.80
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Solution
The fourth proportional to 80,885.40, 121,328.10 and 78,163.80 is: 117,245.70
Step by Step Solution
- Step 1: Write the proportion equation
80,885.40 : 121,328.10 = 78,163.80 : x - Step 2: Convert to fraction form
80,885.40/121,328.10 = 78,163.80/x - Step 3: Cross multiply
80,885.40x = 121,328.10 × 78,163.80 - Step 4: Simplify right side
80,885.40x = 9,483,465,342.78 - Step 5: Solve for x
x = 9,483,465,342.78/80,885.40 - Step 6: Final answer
x = 117,245.70
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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.