Finding the Fourth Proportional to 86,586.80, 129,880.20 and 66,903.80
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Solution
The fourth proportional to 86,586.80, 129,880.20 and 66,903.80 is: 100,355.70
Step by Step Solution
- Step 1: Write the proportion equation
86,586.80 : 129,880.20 = 66,903.80 : x - Step 2: Convert to fraction form
86,586.80/129,880.20 = 66,903.80/x - Step 3: Cross multiply
86,586.80x = 129,880.20 × 66,903.80 - Step 4: Simplify right side
86,586.80x = 8,689,478,924.76 - Step 5: Solve for x
x = 8,689,478,924.76/86,586.80 - Step 6: Final answer
x = 100,355.70
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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.