Finding the Fourth Proportional to 687.18, 948.62 and 438.84
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Solution
The fourth proportional to 687.18, 948.62 and 438.84 is: 605.79
Step by Step Solution
- Step 1: Write the proportion equation
687.18 : 948.62 = 438.84 : x - Step 2: Convert to fraction form
687.18/948.62 = 438.84/x - Step 3: Cross multiply
687.18x = 948.62 × 438.84 - Step 4: Simplify right side
687.18x = 416,290.21 - Step 5: Solve for x
x = 416,290.21/687.18 - Step 6: Final answer
x = 605.79
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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.