Finding the Fourth Proportional to 201.79, 278.43 and 128.13
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Solution
The fourth proportional to 201.79, 278.43 and 128.13 is: 176.79
Step by Step Solution
- Step 1: Write the proportion equation
201.79 : 278.43 = 128.13 : x - Step 2: Convert to fraction form
201.79/278.43 = 128.13/x - Step 3: Cross multiply
201.79x = 278.43 × 128.13 - Step 4: Simplify right side
201.79x = 35,675.24 - Step 5: Solve for x
x = 35,675.24/201.79 - Step 6: Final answer
x = 176.79
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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.