Finding the Fourth Proportional to 643.68, 965.74 and 210.88
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Solution
The fourth proportional to 643.68, 965.74 and 210.88 is: 316.39
Step by Step Solution
- Step 1: Write the proportion equation
643.68 : 965.74 = 210.88 : x - Step 2: Convert to fraction form
643.68/965.74 = 210.88/x - Step 3: Cross multiply
643.68x = 965.74 × 210.88 - Step 4: Simplify right side
643.68x = 203,655.25 - Step 5: Solve for x
x = 203,655.25/643.68 - Step 6: Final answer
x = 316.39
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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.