Finding the Fourth Proportional to 128.26, 176.98 and 84.58
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Solution
The fourth proportional to 128.26, 176.98 and 84.58 is: 116.71
Step by Step Solution
- Step 1: Write the proportion equation
128.26 : 176.98 = 84.58 : x - Step 2: Convert to fraction form
128.26/176.98 = 84.58/x - Step 3: Cross multiply
128.26x = 176.98 × 84.58 - Step 4: Simplify right side
128.26x = 14,968.97 - Step 5: Solve for x
x = 14,968.97/128.26 - Step 6: Final answer
x = 116.71
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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.