Finding the Fourth Proportional to 209.13, 313.49 and 87.23
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Solution
The fourth proportional to 209.13, 313.49 and 87.23 is: 130.75
Step by Step Solution
- Step 1: Write the proportion equation
209.13 : 313.49 = 87.23 : x - Step 2: Convert to fraction form
209.13/313.49 = 87.23/x - Step 3: Cross multiply
209.13x = 313.49 × 87.23 - Step 4: Simplify right side
209.13x = 27,343.73 - Step 5: Solve for x
x = 27,343.73/209.13 - Step 6: Final answer
x = 130.75
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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.