Finding the Fourth Proportional to 125.18, 187.81 and 77.12
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Solution
The fourth proportional to 125.18, 187.81 and 77.12 is: 115.70
Step by Step Solution
- Step 1: Write the proportion equation
125.18 : 187.81 = 77.12 : x - Step 2: Convert to fraction form
125.18/187.81 = 77.12/x - Step 3: Cross multiply
125.18x = 187.81 × 77.12 - Step 4: Simplify right side
125.18x = 14,482.58 - Step 5: Solve for x
x = 14,482.58/125.18 - Step 6: Final answer
x = 115.70
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.