Finding the Fourth Proportional to 221.63, 305.84 and 129.63
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Solution
The fourth proportional to 221.63, 305.84 and 129.63 is: 178.88
Step by Step Solution
- Step 1: Write the proportion equation
221.63 : 305.84 = 129.63 : x - Step 2: Convert to fraction form
221.63/305.84 = 129.63/x - Step 3: Cross multiply
221.63x = 305.84 × 129.63 - Step 4: Simplify right side
221.63x = 39,644.83 - Step 5: Solve for x
x = 39,644.83/221.63 - Step 6: Final answer
x = 178.88
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.