Finding the Fourth Proportional to 76,811.75, 115,217.70 and 21,407.75
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Solution
The fourth proportional to 76,811.75, 115,217.70 and 21,407.75 is: 32,111.65
Step by Step Solution
- Step 1: Write the proportion equation
76,811.75 : 115,217.70 = 21,407.75 : x - Step 2: Convert to fraction form
76,811.75/115,217.70 = 21,407.75/x - Step 3: Cross multiply
76,811.75x = 115,217.70 × 21,407.75 - Step 4: Simplify right side
76,811.75x = 2,466,551,717.18 - Step 5: Solve for x
x = 2,466,551,717.18/76,811.75 - Step 6: Final answer
x = 32,111.65
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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.