Finding the Fourth Proportional to 57.54, 86.31 and 20.99
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Solution
The fourth proportional to 57.54, 86.31 and 20.99 is: 31.48
Step by Step Solution
- Step 1: Write the proportion equation
57.54 : 86.31 = 20.99 : x - Step 2: Convert to fraction form
57.54/86.31 = 20.99/x - Step 3: Cross multiply
57.54x = 86.31 × 20.99 - Step 4: Simplify right side
57.54x = 1,811.22 - Step 5: Solve for x
x = 1,811.22/57.54 - Step 6: Final answer
x = 31.48
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Similar ratio
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.