Finding the Fourth Proportional to 139.22, 208.71 and 70.70
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Solution
The fourth proportional to 139.22, 208.71 and 70.70 is: 105.99
Step by Step Solution
- Step 1: Write the proportion equation
139.22 : 208.71 = 70.70 : x - Step 2: Convert to fraction form
139.22/208.71 = 70.70/x - Step 3: Cross multiply
139.22x = 208.71 × 70.70 - Step 4: Simplify right side
139.22x = 14,754.75 - Step 5: Solve for x
x = 14,754.75/139.22 - Step 6: Final answer
x = 105.99
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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.