Finding the Fourth Proportional to 260.76, 390.99 and 138.99
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Solution
The fourth proportional to 260.76, 390.99 and 138.99 is: 208.41
Step by Step Solution
- Step 1: Write the proportion equation
260.76 : 390.99 = 138.99 : x - Step 2: Convert to fraction form
260.76/390.99 = 138.99/x - Step 3: Cross multiply
260.76x = 390.99 × 138.99 - Step 4: Simplify right side
260.76x = 54,343.70 - Step 5: Solve for x
x = 54,343.70/260.76 - Step 6: Final answer
x = 208.41
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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.