Finding the Fourth Proportional to 128.24, 177.08 and 84.64
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Solution
The fourth proportional to 128.24, 177.08 and 84.64 is: 116.88
Step by Step Solution
- Step 1: Write the proportion equation
128.24 : 177.08 = 84.64 : x - Step 2: Convert to fraction form
128.24/177.08 = 84.64/x - Step 3: Cross multiply
128.24x = 177.08 × 84.64 - Step 4: Simplify right side
128.24x = 14,988.05 - Step 5: Solve for x
x = 14,988.05/128.24 - Step 6: Final answer
x = 116.88
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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.