Finding the Fourth Proportional to 122.91, 169.64 and 79.26
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Solution
The fourth proportional to 122.91, 169.64 and 79.26 is: 109.39
Step by Step Solution
- Step 1: Write the proportion equation
122.91 : 169.64 = 79.26 : x - Step 2: Convert to fraction form
122.91/169.64 = 79.26/x - Step 3: Cross multiply
122.91x = 169.64 × 79.26 - Step 4: Simplify right side
122.91x = 13,445.67 - Step 5: Solve for x
x = 13,445.67/122.91 - Step 6: Final answer
x = 109.39
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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.