Finding the Fourth Proportional to 139.99, 209.80 and 112.99
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Solution
The fourth proportional to 139.99, 209.80 and 112.99 is: 169.33
Step by Step Solution
- Step 1: Write the proportion equation
139.99 : 209.80 = 112.99 : x - Step 2: Convert to fraction form
139.99/209.80 = 112.99/x - Step 3: Cross multiply
139.99x = 209.80 × 112.99 - Step 4: Simplify right side
139.99x = 23,703.97 - Step 5: Solve for x
x = 23,703.97/139.99 - Step 6: Final answer
x = 169.33
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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.