Finding the Fourth Proportional to 129.90, 194.84 and 68.99
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Solution
The fourth proportional to 129.90, 194.84 and 68.99 is: 103.47
Step by Step Solution
- Step 1: Write the proportion equation
129.90 : 194.84 = 68.99 : x - Step 2: Convert to fraction form
129.90/194.84 = 68.99/x - Step 3: Cross multiply
129.90x = 194.84 × 68.99 - Step 4: Simplify right side
129.90x = 13,440.95 - Step 5: Solve for x
x = 13,440.95/129.90 - Step 6: Final answer
x = 103.47
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.