Finding the Fourth Proportional to 139.29, 208.94 and 43.09
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Solution
The fourth proportional to 139.29, 208.94 and 43.09 is: 64.64
Step by Step Solution
- Step 1: Write the proportion equation
139.29 : 208.94 = 43.09 : x - Step 2: Convert to fraction form
139.29/208.94 = 43.09/x - Step 3: Cross multiply
139.29x = 208.94 × 43.09 - Step 4: Simplify right side
139.29x = 9,003.22 - Step 5: Solve for x
x = 9,003.22/139.29 - Step 6: Final answer
x = 64.64
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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.