Finding the Fourth Proportional to 128.44, 177.14 and 79.28
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Solution
The fourth proportional to 128.44, 177.14 and 79.28 is: 109.34
Step by Step Solution
- Step 1: Write the proportion equation
128.44 : 177.14 = 79.28 : x - Step 2: Convert to fraction form
128.44/177.14 = 79.28/x - Step 3: Cross multiply
128.44x = 177.14 × 79.28 - Step 4: Simplify right side
128.44x = 14,043.19 - Step 5: Solve for x
x = 14,043.19/128.44 - Step 6: Final answer
x = 109.34
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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.