Finding the Fourth Proportional to 79.60, 119.93 and 68.80
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Solution
The fourth proportional to 79.60, 119.93 and 68.80 is: 103.66
Step by Step Solution
- Step 1: Write the proportion equation
79.60 : 119.93 = 68.80 : x - Step 2: Convert to fraction form
79.60/119.93 = 68.80/x - Step 3: Cross multiply
79.60x = 119.93 × 68.80 - Step 4: Simplify right side
79.60x = 8,251.18 - Step 5: Solve for x
x = 8,251.18/79.60 - Step 6: Final answer
x = 103.66
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.