Finding the Fourth Proportional to 79.20, 118.80 and 73.80
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Solution
The fourth proportional to 79.20, 118.80 and 73.80 is: 110.70
Step by Step Solution
- Step 1: Write the proportion equation
79.20 : 118.80 = 73.80 : x - Step 2: Convert to fraction form
79.20/118.80 = 73.80/x - Step 3: Cross multiply
79.20x = 118.80 × 73.80 - Step 4: Simplify right side
79.20x = 8,767.44 - Step 5: Solve for x
x = 8,767.44/79.20 - Step 6: Final answer
x = 110.70
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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.