Finding the Fourth Proportional to 79.74, 119.34 and 76.68
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Solution
The fourth proportional to 79.74, 119.34 and 76.68 is: 114.76
Step by Step Solution
- Step 1: Write the proportion equation
79.74 : 119.34 = 76.68 : x - Step 2: Convert to fraction form
79.74/119.34 = 76.68/x - Step 3: Cross multiply
79.74x = 119.34 × 76.68 - Step 4: Simplify right side
79.74x = 9,150.99 - Step 5: Solve for x
x = 9,150.99/79.74 - Step 6: Final answer
x = 114.76
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.