Finding the Fourth Proportional to 129.10, 178.28 and 79.99
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Solution
The fourth proportional to 129.10, 178.28 and 79.99 is: 110.46
Step by Step Solution
- Step 1: Write the proportion equation
129.10 : 178.28 = 79.99 : x - Step 2: Convert to fraction form
129.10/178.28 = 79.99/x - Step 3: Cross multiply
129.10x = 178.28 × 79.99 - Step 4: Simplify right side
129.10x = 14,260.74 - Step 5: Solve for x
x = 14,260.74/129.10 - Step 6: Final answer
x = 110.46
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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.