Finding the Fourth Proportional to 253.99, 381.21 and 145.63
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Solution
The fourth proportional to 253.99, 381.21 and 145.63 is: 218.57
Step by Step Solution
- Step 1: Write the proportion equation
253.99 : 381.21 = 145.63 : x - Step 2: Convert to fraction form
253.99/381.21 = 145.63/x - Step 3: Cross multiply
253.99x = 381.21 × 145.63 - Step 4: Simplify right side
253.99x = 55,515.61 - Step 5: Solve for x
x = 55,515.61/253.99 - Step 6: Final answer
x = 218.57
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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.