Finding the Fourth Proportional to 129.09, 178.08 and 79.98
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Solution
The fourth proportional to 129.09, 178.08 and 79.98 is: 110.33
Step by Step Solution
- Step 1: Write the proportion equation
129.09 : 178.08 = 79.98 : x - Step 2: Convert to fraction form
129.09/178.08 = 79.98/x - Step 3: Cross multiply
129.09x = 178.08 × 79.98 - Step 4: Simplify right side
129.09x = 14,242.84 - Step 5: Solve for x
x = 14,242.84/129.09 - Step 6: Final answer
x = 110.33
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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.