Finding the Fourth Proportional to 81,195.11, 121,780.36 and 31,298.70
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Solution
The fourth proportional to 81,195.11, 121,780.36 and 31,298.70 is: 46,943.31
Step by Step Solution
- Step 1: Write the proportion equation
81,195.11 : 121,780.36 = 31,298.70 : x - Step 2: Convert to fraction form
81,195.11/121,780.36 = 31,298.70/x - Step 3: Cross multiply
81,195.11x = 121,780.36 × 31,298.70 - Step 4: Simplify right side
81,195.11x = 3,811,567,449.33 - Step 5: Solve for x
x = 3,811,567,449.33/81,195.11 - Step 6: Final answer
x = 46,943.31
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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.