Finding the Fourth Proportional to 187.70, 259.11 and 128.99
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Solution
The fourth proportional to 187.70, 259.11 and 128.99 is: 178.07
Step by Step Solution
- Step 1: Write the proportion equation
187.70 : 259.11 = 128.99 : x - Step 2: Convert to fraction form
187.70/259.11 = 128.99/x - Step 3: Cross multiply
187.70x = 259.11 × 128.99 - Step 4: Simplify right side
187.70x = 33,423.25 - Step 5: Solve for x
x = 33,423.25/187.70 - Step 6: Final answer
x = 178.07
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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.