Finding the Fourth Proportional to 128.67, 177.62 and 84.99
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Solution
The fourth proportional to 128.67, 177.62 and 84.99 is: 117.32
Step by Step Solution
- Step 1: Write the proportion equation
128.67 : 177.62 = 84.99 : x - Step 2: Convert to fraction form
128.67/177.62 = 84.99/x - Step 3: Cross multiply
128.67x = 177.62 × 84.99 - Step 4: Simplify right side
128.67x = 15,095.50 - Step 5: Solve for x
x = 15,095.50/128.67 - Step 6: Final answer
x = 117.32
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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.