Finding the Fourth Proportional to 90.91, 136.05 and 83.98
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Solution
The fourth proportional to 90.91, 136.05 and 83.98 is: 125.68
Step by Step Solution
- Step 1: Write the proportion equation
90.91 : 136.05 = 83.98 : x - Step 2: Convert to fraction form
90.91/136.05 = 83.98/x - Step 3: Cross multiply
90.91x = 136.05 × 83.98 - Step 4: Simplify right side
90.91x = 11,425.48 - Step 5: Solve for x
x = 11,425.48/90.91 - Step 6: Final answer
x = 125.68
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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.