Finding the Fourth Proportional to 87.21, 120.08 and 77.23
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Solution
The fourth proportional to 87.21, 120.08 and 77.23 is: 106.34
Step by Step Solution
- Step 1: Write the proportion equation
87.21 : 120.08 = 77.23 : x - Step 2: Convert to fraction form
87.21/120.08 = 77.23/x - Step 3: Cross multiply
87.21x = 120.08 × 77.23 - Step 4: Simplify right side
87.21x = 9,274.12 - Step 5: Solve for x
x = 9,274.12/87.21 - Step 6: Final answer
x = 106.34
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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.