Finding the Fourth Proportional to 391.65, 540.47 and 216.99
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Solution
The fourth proportional to 391.65, 540.47 and 216.99 is: 299.45
Step by Step Solution
- Step 1: Write the proportion equation
391.65 : 540.47 = 216.99 : x - Step 2: Convert to fraction form
391.65/540.47 = 216.99/x - Step 3: Cross multiply
391.65x = 540.47 × 216.99 - Step 4: Simplify right side
391.65x = 117,277.13 - Step 5: Solve for x
x = 117,277.13/391.65 - Step 6: Final answer
x = 299.45
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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.