Finding the Fourth Proportional to 129,310.16, 178,446.30 and 72,721.53
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Solution
The fourth proportional to 129,310.16, 178,446.30 and 72,721.53 is: 100,354.75
Step by Step Solution
- Step 1: Write the proportion equation
129,310.16 : 178,446.30 = 72,721.53 : x - Step 2: Convert to fraction form
129,310.16/178,446.30 = 72,721.53/x - Step 3: Cross multiply
129,310.16x = 178,446.30 × 72,721.53 - Step 4: Simplify right side
129,310.16x = 12,976,887,686.13 - Step 5: Solve for x
x = 12,976,887,686.13/129,310.16 - Step 6: Final answer
x = 100,354.75
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.