Finding the Fourth Proportional to 126.99, 189.99 and 86.44
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Solution
The fourth proportional to 126.99, 189.99 and 86.44 is: 129.32
Step by Step Solution
- Step 1: Write the proportion equation
126.99 : 189.99 = 86.44 : x - Step 2: Convert to fraction form
126.99/189.99 = 86.44/x - Step 3: Cross multiply
126.99x = 189.99 × 86.44 - Step 4: Simplify right side
126.99x = 16,422.74 - Step 5: Solve for x
x = 16,422.74/126.99 - Step 6: Final answer
x = 129.32
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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.