Finding the Fourth Proportional to 81,390.84, 122,104.80 and 31,471.08
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Solution
The fourth proportional to 81,390.84, 122,104.80 and 31,471.08 is: 47,213.79
Step by Step Solution
- Step 1: Write the proportion equation
81,390.84 : 122,104.80 = 31,471.08 : x - Step 2: Convert to fraction form
81,390.84/122,104.80 = 31,471.08/x - Step 3: Cross multiply
81,390.84x = 122,104.80 × 31,471.08 - Step 4: Simplify right side
81,390.84x = 3,842,769,929.18 - Step 5: Solve for x
x = 3,842,769,929.18/81,390.84 - Step 6: Final answer
x = 47,213.79
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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.