Finding the Fourth Proportional to 128.48, 177.26 and 77.99
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Solution
The fourth proportional to 128.48, 177.26 and 77.99 is: 107.60
Step by Step Solution
- Step 1: Write the proportion equation
128.48 : 177.26 = 77.99 : x - Step 2: Convert to fraction form
128.48/177.26 = 77.99/x - Step 3: Cross multiply
128.48x = 177.26 × 77.99 - Step 4: Simplify right side
128.48x = 13,824.12 - Step 5: Solve for x
x = 13,824.12/128.48 - Step 6: Final answer
x = 107.60
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.