Finding the Fourth Proportional to 157.15, 216.99 and 122.13
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Solution
The fourth proportional to 157.15, 216.99 and 122.13 is: 168.63
Step by Step Solution
- Step 1: Write the proportion equation
157.15 : 216.99 = 122.13 : x - Step 2: Convert to fraction form
157.15/216.99 = 122.13/x - Step 3: Cross multiply
157.15x = 216.99 × 122.13 - Step 4: Simplify right side
157.15x = 26,500.99 - Step 5: Solve for x
x = 26,500.99/157.15 - Step 6: Final answer
x = 168.63
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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.