Finding the Fourth Proportional to 305.74, 421.91 and 187.68
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Solution
The fourth proportional to 305.74, 421.91 and 187.68 is: 258.99
Step by Step Solution
- Step 1: Write the proportion equation
305.74 : 421.91 = 187.68 : x - Step 2: Convert to fraction form
305.74/421.91 = 187.68/x - Step 3: Cross multiply
305.74x = 421.91 × 187.68 - Step 4: Simplify right side
305.74x = 79,185.42 - Step 5: Solve for x
x = 79,185.42/305.74 - Step 6: Final answer
x = 258.99
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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.