Finding the Fourth Proportional to 139.99, 193.08 and 84.68
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Solution
The fourth proportional to 139.99, 193.08 and 84.68 is: 116.79
Step by Step Solution
- Step 1: Write the proportion equation
139.99 : 193.08 = 84.68 : x - Step 2: Convert to fraction form
139.99/193.08 = 84.68/x - Step 3: Cross multiply
139.99x = 193.08 × 84.68 - Step 4: Simplify right side
139.99x = 16,350.01 - Step 5: Solve for x
x = 16,350.01/139.99 - Step 6: Final answer
x = 116.79
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.