Finding the Fourth Proportional to 81,102.87, 121,680.30 and 38,985.99
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Solution
The fourth proportional to 81,102.87, 121,680.30 and 38,985.99 is: 58,491.48
Step by Step Solution
- Step 1: Write the proportion equation
81,102.87 : 121,680.30 = 38,985.99 : x - Step 2: Convert to fraction form
81,102.87/121,680.30 = 38,985.99/x - Step 3: Cross multiply
81,102.87x = 121,680.30 × 38,985.99 - Step 4: Simplify right side
81,102.87x = 4,743,826,959.00 - Step 5: Solve for x
x = 4,743,826,959.00/81,102.87 - Step 6: Final answer
x = 58,491.48
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Double scale
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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.