Finding the Fourth Proportional to 129.18, 178.16 and 79.98
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Solution
The fourth proportional to 129.18, 178.16 and 79.98 is: 110.31
Step by Step Solution
- Step 1: Write the proportion equation
129.18 : 178.16 = 79.98 : x - Step 2: Convert to fraction form
129.18/178.16 = 79.98/x - Step 3: Cross multiply
129.18x = 178.16 × 79.98 - Step 4: Simplify right side
129.18x = 14,249.24 - Step 5: Solve for x
x = 14,249.24/129.18 - Step 6: Final answer
x = 110.31
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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.