Finding the Fourth Proportional to 3.99, 5.51 and 3.31
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Solution
The fourth proportional to 3.99, 5.51 and 3.31 is: 4.56
Step by Step Solution
- Step 1: Write the proportion equation
3.99 : 5.51 = 3.31 : x - Step 2: Convert to fraction form
3.99/5.51 = 3.31/x - Step 3: Cross multiply
3.99x = 5.51 × 3.31 - Step 4: Simplify right side
3.99x = 18.23 - Step 5: Solve for x
x = 18.23/3.99 - Step 6: Final answer
x = 4.56
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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.