Finding the Fourth Proportional to 129.37, 178.61 and 87.99
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Solution
The fourth proportional to 129.37, 178.61 and 87.99 is: 121.47
Step by Step Solution
- Step 1: Write the proportion equation
129.37 : 178.61 = 87.99 : x - Step 2: Convert to fraction form
129.37/178.61 = 87.99/x - Step 3: Cross multiply
129.37x = 178.61 × 87.99 - Step 4: Simplify right side
129.37x = 15,714.78 - Step 5: Solve for x
x = 15,714.78/129.37 - Step 6: Final answer
x = 121.47
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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.