Finding the Fourth Proportional to 87.12, 120.15 and 73.06
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Solution
The fourth proportional to 87.12, 120.15 and 73.06 is: 100.75
Step by Step Solution
- Step 1: Write the proportion equation
87.12 : 120.15 = 73.06 : x - Step 2: Convert to fraction form
87.12/120.15 = 73.06/x - Step 3: Cross multiply
87.12x = 120.15 × 73.06 - Step 4: Simplify right side
87.12x = 8,777.19 - Step 5: Solve for x
x = 8,777.19/87.12 - Step 6: Final answer
x = 100.75
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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.