Finding the Fourth Proportional to 81,282.12, 121,812.38 and 39,159.14
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Solution
The fourth proportional to 81,282.12, 121,812.38 and 39,159.14 is: 58,685.32
Step by Step Solution
- Step 1: Write the proportion equation
81,282.12 : 121,812.38 = 39,159.14 : x - Step 2: Convert to fraction form
81,282.12/121,812.38 = 39,159.14/x - Step 3: Cross multiply
81,282.12x = 121,812.38 × 39,159.14 - Step 4: Simplify right side
81,282.12x = 4,770,067,530.99 - Step 5: Solve for x
x = 4,770,067,530.99/81,282.12 - Step 6: Final answer
x = 58,685.32
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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.