Finding the Fourth Proportional to 79.68, 118.96 and 74.79
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Solution
The fourth proportional to 79.68, 118.96 and 74.79 is: 111.66
Step by Step Solution
- Step 1: Write the proportion equation
79.68 : 118.96 = 74.79 : x - Step 2: Convert to fraction form
79.68/118.96 = 74.79/x - Step 3: Cross multiply
79.68x = 118.96 × 74.79 - Step 4: Simplify right side
79.68x = 8,896.78 - Step 5: Solve for x
x = 8,896.78/79.68 - Step 6: Final answer
x = 111.66
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.