Finding the Fourth Proportional to 81,621.20, 122,431.80 and 72,435.80
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Solution
The fourth proportional to 81,621.20, 122,431.80 and 72,435.80 is: 108,653.70
Step by Step Solution
- Step 1: Write the proportion equation
81,621.20 : 122,431.80 = 72,435.80 : x - Step 2: Convert to fraction form
81,621.20/122,431.80 = 72,435.80/x - Step 3: Cross multiply
81,621.20x = 122,431.80 × 72,435.80 - Step 4: Simplify right side
81,621.20x = 8,868,445,378.44 - Step 5: Solve for x
x = 8,868,445,378.44/81,621.20 - Step 6: Final answer
x = 108,653.70
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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.