Finding the Fourth Proportional to 128.28, 176.99 and 84.68
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Solution
The fourth proportional to 128.28, 176.99 and 84.68 is: 116.82
Step by Step Solution
- Step 1: Write the proportion equation
128.28 : 176.99 = 84.68 : x - Step 2: Convert to fraction form
128.28/176.99 = 84.68/x - Step 3: Cross multiply
128.28x = 176.99 × 84.68 - Step 4: Simplify right side
128.28x = 14,986.20 - Step 5: Solve for x
x = 14,986.20/128.28 - Step 6: Final answer
x = 116.82
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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.