Finding the Fourth Proportional to 18.60, 25.68 and 15.70
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Solution
The fourth proportional to 18.60, 25.68 and 15.70 is: 21.68
Step by Step Solution
- Step 1: Write the proportion equation
18.60 : 25.68 = 15.70 : x - Step 2: Convert to fraction form
18.60/25.68 = 15.70/x - Step 3: Cross multiply
18.60x = 25.68 × 15.70 - Step 4: Simplify right side
18.60x = 403.18 - Step 5: Solve for x
x = 403.18/18.60 - Step 6: Final answer
x = 21.68
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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.