Finding the Fourth Proportional to 90.99, 136.98 and 79.65
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Solution
The fourth proportional to 90.99, 136.98 and 79.65 is: 119.91
Step by Step Solution
- Step 1: Write the proportion equation
90.99 : 136.98 = 79.65 : x - Step 2: Convert to fraction form
90.99/136.98 = 79.65/x - Step 3: Cross multiply
90.99x = 136.98 × 79.65 - Step 4: Simplify right side
90.99x = 10,910.46 - Step 5: Solve for x
x = 10,910.46/90.99 - Step 6: Final answer
x = 119.91
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.