Finding the Fourth Proportional to 231.99, 320.21 and 138.75
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Solution
The fourth proportional to 231.99, 320.21 and 138.75 is: 191.51
Step by Step Solution
- Step 1: Write the proportion equation
231.99 : 320.21 = 138.75 : x - Step 2: Convert to fraction form
231.99/320.21 = 138.75/x - Step 3: Cross multiply
231.99x = 320.21 × 138.75 - Step 4: Simplify right side
231.99x = 44,428.44 - Step 5: Solve for x
x = 44,428.44/231.99 - Step 6: Final answer
x = 191.51
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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.