Finding the Fourth Proportional to 138,521.80, 207,782.70 and 121,025.80
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Solution
The fourth proportional to 138,521.80, 207,782.70 and 121,025.80 is: 181,538.70
Step by Step Solution
- Step 1: Write the proportion equation
138,521.80 : 207,782.70 = 121,025.80 : x - Step 2: Convert to fraction form
138,521.80/207,782.70 = 121,025.80/x - Step 3: Cross multiply
138,521.80x = 207,782.70 × 121,025.80 - Step 4: Simplify right side
138,521.80x = 25,147,067,493.66 - Step 5: Solve for x
x = 25,147,067,493.66/138,521.80 - Step 6: Final answer
x = 181,538.70
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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.