Finding the Fourth Proportional to 189.99, 284.99 and 81.68
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Solution
The fourth proportional to 189.99, 284.99 and 81.68 is: 122.51
Step by Step Solution
- Step 1: Write the proportion equation
189.99 : 284.99 = 81.68 : x - Step 2: Convert to fraction form
189.99/284.99 = 81.68/x - Step 3: Cross multiply
189.99x = 284.99 × 81.68 - Step 4: Simplify right side
189.99x = 23,276.15 - Step 5: Solve for x
x = 23,276.15/189.99 - Step 6: Final answer
x = 122.51
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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.