Finding the Fourth Proportional to 67,139.78, 100,709.66 and 31,578.99
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Solution
The fourth proportional to 67,139.78, 100,709.66 and 31,578.99 is: 47,368.48
Step by Step Solution
- Step 1: Write the proportion equation
67,139.78 : 100,709.66 = 31,578.99 : x - Step 2: Convert to fraction form
67,139.78/100,709.66 = 31,578.99/x - Step 3: Cross multiply
67,139.78x = 100,709.66 × 31,578.99 - Step 4: Simplify right side
67,139.78x = 3,180,309,047.33 - Step 5: Solve for x
x = 3,180,309,047.33/67,139.78 - Step 6: Final answer
x = 47,368.48
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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.