Finding the Fourth Proportional to 88.70, 122.34 and 77.80
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Solution
The fourth proportional to 88.70, 122.34 and 77.80 is: 107.31
Step by Step Solution
- Step 1: Write the proportion equation
88.70 : 122.34 = 77.80 : x - Step 2: Convert to fraction form
88.70/122.34 = 77.80/x - Step 3: Cross multiply
88.70x = 122.34 × 77.80 - Step 4: Simplify right side
88.70x = 9,518.05 - Step 5: Solve for x
x = 9,518.05/88.70 - Step 6: Final answer
x = 107.31
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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.