Finding the Fourth Proportional to 128,423.70, 192,635.55 and 45,317.70
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Solution
The fourth proportional to 128,423.70, 192,635.55 and 45,317.70 is: 67,976.55
Step by Step Solution
- Step 1: Write the proportion equation
128,423.70 : 192,635.55 = 45,317.70 : x - Step 2: Convert to fraction form
128,423.70/192,635.55 = 45,317.70/x - Step 3: Cross multiply
128,423.70x = 192,635.55 × 45,317.70 - Step 4: Simplify right side
128,423.70x = 8,729,800,064.24 - Step 5: Solve for x
x = 8,729,800,064.24/128,423.70 - Step 6: Final answer
x = 67,976.55
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Similar ratio
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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.