Finding the Fourth Proportional to 129,828.70, 194,743.05 and 81,155.80
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Solution
The fourth proportional to 129,828.70, 194,743.05 and 81,155.80 is: 121,733.70
Step by Step Solution
- Step 1: Write the proportion equation
129,828.70 : 194,743.05 = 81,155.80 : x - Step 2: Convert to fraction form
129,828.70/194,743.05 = 81,155.80/x - Step 3: Cross multiply
129,828.70x = 194,743.05 × 81,155.80 - Step 4: Simplify right side
129,828.70x = 15,804,528,017.19 - Step 5: Solve for x
x = 15,804,528,017.19/129,828.70 - Step 6: Final answer
x = 121,733.70
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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.