Finding the Fourth Proportional to 261.51, 390.21 and 259.99
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Solution
The fourth proportional to 261.51, 390.21 and 259.99 is: 387.95
Step by Step Solution
- Step 1: Write the proportion equation
261.51 : 390.21 = 259.99 : x - Step 2: Convert to fraction form
261.51/390.21 = 259.99/x - Step 3: Cross multiply
261.51x = 390.21 × 259.99 - Step 4: Simplify right side
261.51x = 101,450.21 - Step 5: Solve for x
x = 101,450.21/261.51 - Step 6: Final answer
x = 387.95
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.