Finding the Fourth Proportional to 89.75, 123.84 and 56.99
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Solution
The fourth proportional to 89.75, 123.84 and 56.99 is: 78.63
Step by Step Solution
- Step 1: Write the proportion equation
89.75 : 123.84 = 56.99 : x - Step 2: Convert to fraction form
89.75/123.84 = 56.99/x - Step 3: Cross multiply
89.75x = 123.84 × 56.99 - Step 4: Simplify right side
89.75x = 7,057.02 - Step 5: Solve for x
x = 7,057.02/89.75 - Step 6: Final answer
x = 78.63
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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.