Finding the Fourth Proportional to 839,815,231.20, 1,259,722,846.80 and 257,639,330.40
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Solution
The fourth proportional to 839,815,231.20, 1,259,722,846.80 and 257,639,330.40 is: 386,458,995.60
Step by Step Solution
- Step 1: Write the proportion equation
839,815,231.20 : 1,259,722,846.80 = 257,639,330.40 : x - Step 2: Convert to fraction form
839,815,231.20/1,259,722,846.80 = 257,639,330.40/x - Step 3: Cross multiply
839,815,231.20x = 1,259,722,846.80 × 257,639,330.40 - Step 4: Simplify right side
839,815,231.20x = 324,554,150,739,133,760 - Step 5: Solve for x
x = 324,554,150,739,133,760/839,815,231.20 - Step 6: Final answer
x = 386,458,995.60
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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.