Finding the Fourth Proportional to 318.99, 439.79 and 220.78
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Solution
The fourth proportional to 318.99, 439.79 and 220.78 is: 304.39
Step by Step Solution
- Step 1: Write the proportion equation
318.99 : 439.79 = 220.78 : x - Step 2: Convert to fraction form
318.99/439.79 = 220.78/x - Step 3: Cross multiply
318.99x = 439.79 × 220.78 - Step 4: Simplify right side
318.99x = 97,096.84 - Step 5: Solve for x
x = 97,096.84/318.99 - Step 6: Final answer
x = 304.39
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1.5x scale
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.