Finding the Fourth Proportional to 644.76, 889.84 and 395.99
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Solution
The fourth proportional to 644.76, 889.84 and 395.99 is: 546.51
Step by Step Solution
- Step 1: Write the proportion equation
644.76 : 889.84 = 395.99 : x - Step 2: Convert to fraction form
644.76/889.84 = 395.99/x - Step 3: Cross multiply
644.76x = 889.84 × 395.99 - Step 4: Simplify right side
644.76x = 352,367.74 - Step 5: Solve for x
x = 352,367.74/644.76 - Step 6: Final answer
x = 546.51
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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.