Finding the Fourth Proportional to 128.23, 177.08 and 88.99
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Solution
The fourth proportional to 128.23, 177.08 and 88.99 is: 122.89
Step by Step Solution
- Step 1: Write the proportion equation
128.23 : 177.08 = 88.99 : x - Step 2: Convert to fraction form
128.23/177.08 = 88.99/x - Step 3: Cross multiply
128.23x = 177.08 × 88.99 - Step 4: Simplify right side
128.23x = 15,758.13 - Step 5: Solve for x
x = 15,758.13/128.23 - Step 6: Final answer
x = 122.89
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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.