Finding the Fourth Proportional to 87.85, 121.40 and 73.08
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Solution
The fourth proportional to 87.85, 121.40 and 73.08 is: 100.99
Step by Step Solution
- Step 1: Write the proportion equation
87.85 : 121.40 = 73.08 : x - Step 2: Convert to fraction form
87.85/121.40 = 73.08/x - Step 3: Cross multiply
87.85x = 121.40 × 73.08 - Step 4: Simplify right side
87.85x = 8,871.91 - Step 5: Solve for x
x = 8,871.91/87.85 - Step 6: Final answer
x = 100.99
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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.