Finding the Fourth Proportional to 81.09, 121.64 and 26.99
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Solution
The fourth proportional to 81.09, 121.64 and 26.99 is: 40.48
Step by Step Solution
- Step 1: Write the proportion equation
81.09 : 121.64 = 26.99 : x - Step 2: Convert to fraction form
81.09/121.64 = 26.99/x - Step 3: Cross multiply
81.09x = 121.64 × 26.99 - Step 4: Simplify right side
81.09x = 3,282.32 - Step 5: Solve for x
x = 3,282.32/81.09 - Step 6: Final answer
x = 40.48
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Double scale
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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.