Finding the Fourth Proportional to 112.99, 155.99 and 78
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Solution
The fourth proportional to 112.99, 155.99 and 78 is: 107.69
Step by Step Solution
- Step 1: Write the proportion equation
112.99 : 155.99 = 78 : x - Step 2: Convert to fraction form
112.99/155.99 = 78/x - Step 3: Cross multiply
112.99x = 155.99 × 78 - Step 4: Simplify right side
112.99x = 12,167.22 - Step 5: Solve for x
x = 12,167.22/112.99 - Step 6: Final answer
x = 107.69
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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.